fix gcc warnings about uninitialized variables

like:

src/shared/install.c: In function ‘unit_file_lookup_state’:
src/shared/install.c:1861:16: warning: ‘r’ may be used uninitialized in
this function [-Wmaybe-uninitialized]
         return r < 0 ? r : state;
                ^
src/shared/install.c:1796:13: note: ‘r’ was declared here
         int r;
             ^

6 files changed, 9 insertions, 9 deletions

diff --git a/src/journal/catalog.c b/src/journal/catalog.c
index e505a05305..0801e13599 100644
--- a/src/journal/catalog.c
+++ b/src/journal/catalog.c
@@ -558,7 +558,7 @@ static const char *find_id(void *p, sd_id128_t id) {
 int catalog_get(const char* database, sd_id128_t id, char **_text) {
         _cleanup_close_ int fd = -1;
         void *p = NULL;
-        struct stat st;
+        struct stat st = {};
         char *text = NULL;
         int r;
         const char *s;
diff --git a/src/journal/coredump.c b/src/journal/coredump.c
index 6357d3e277..4e23e487fb 100644
--- a/src/journal/coredump.c
+++ b/src/journal/coredump.c
@@ -242,7 +242,7 @@ static int maybe_remove_external_coredump(const char *filename, off_t size) {
 
 static int make_filename(const char *info[_INFO_LEN], char **ret) {
         _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL;
-        sd_id128_t boot;
+        sd_id128_t boot = {};
         int r;
 
         assert(info);
@@ -841,7 +841,7 @@ log:
         /* Optionally store the entire coredump in the journal */
         if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) &&
             coredump_size <= (off_t) arg_journal_size_max) {
-                size_t sz;
+                size_t sz = 0;
 
                 /* Store the coredump itself in the journal */
 
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index 8e7642710e..5a4e7cbd7d 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -887,7 +887,7 @@ int journal_file_find_data_object_with_hash(
                 if (o->object.flags & OBJECT_COMPRESSION_MASK) {
 #if defined(HAVE_XZ) || defined(HAVE_LZ4)
                         uint64_t l;
-                        size_t rsize;
+                        size_t rsize = 0;
 
                         l = le64toh(o->object.size);
                         if (l <= offsetof(Object, data.payload))
@@ -1052,7 +1052,7 @@ static int journal_file_append_data(
 #if defined(HAVE_XZ) || defined(HAVE_LZ4)
         if (f->compress_xz &&
             size >= COMPRESSION_SIZE_THRESHOLD) {
-                size_t rsize;
+                size_t rsize = 0;
 
                 compression = compress_blob(data, size, o->data.payload, &rsize);
 
@@ -2886,7 +2886,7 @@ int journal_file_copy_entry(JournalFile *from, JournalFile *to, Object *o, uint6
 
                 if (o->object.flags & OBJECT_COMPRESSION_MASK) {
 #if defined(HAVE_XZ) || defined(HAVE_LZ4)
-                        size_t rsize;
+                        size_t rsize = 0;
 
                         r = decompress_blob(o->object.flags & OBJECT_COMPRESSION_MASK,
                                             o->data.payload, l, &from->compress_buffer, &from->compress_buffer_size, &rsize, 0);
diff --git a/src/journal/journal-vacuum.c b/src/journal/journal-vacuum.c
index a367dc1bb9..81a577ea27 100644
--- a/src/journal/journal-vacuum.c
+++ b/src/journal/journal-vacuum.c
@@ -73,7 +73,7 @@ static void patch_realtime(
                 unsigned long long *realtime) {
 
         _cleanup_free_ const char *path = NULL;
-        usec_t x, crtime;
+        usec_t x, crtime = 0;
 
         /* The timestamp was determined by the file name, but let's
          * see if the file might actually be older than the file name
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 7fbd518d3f..b4f88bcd0a 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -1487,7 +1487,7 @@ static int verify(sd_journal *j) {
 
         ORDERED_HASHMAP_FOREACH(f, j->files, i) {
                 int k;
-                usec_t first, validated, last;
+                usec_t first = 0, validated = 0, last = 0;
 
 #ifdef HAVE_GCRYPT
                 if (!arg_verify_key && JOURNAL_HEADER_SEALED(f->header))
diff --git a/src/journal/test-journal-stream.c b/src/journal/test-journal-stream.c
index 3996e778e6..b8caeb3d41 100644
--- a/src/journal/test-journal-stream.c
+++ b/src/journal/test-journal-stream.c
@@ -42,7 +42,7 @@ static void verify_contents(sd_journal *j, unsigned skip) {
                 const void *d;
                 char *k, *c;
                 size_t l;
-                unsigned u;
+                unsigned u = 0;
 
                 assert_se(sd_journal_get_cursor(j, &k) >= 0);
                 printf("cursor: %s\n", k);