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;
             ^

2 files changed, 2 insertions, 2 deletions

diff --git a/src/test/test-path.c b/src/test/test-path.c
index 4f9f5c1344..a3295aa997 100644
--- a/src/test/test-path.c
+++ b/src/test/test-path.c
@@ -33,7 +33,7 @@ static int setup_test(Manager **m) {
         char **tests_path = STRV_MAKE("exists", "existsglobFOOBAR", "changed", "modified", "unit",
                                       "directorynotempty", "makedirectory");
         char **test_path;
-        Manager *tmp;
+        Manager *tmp = NULL;
         int r;
 
         assert_se(m);
diff --git a/src/test/test-pty.c b/src/test/test-pty.c
index eadecb99a0..b5f4d4f094 100644
--- a/src/test/test-pty.c
+++ b/src/test/test-pty.c
@@ -95,7 +95,7 @@ static void run_parent(Pty *pty) {
 
 static void test_pty(void) {
         pid_t pid;
-        Pty *pty;
+        Pty *pty = NULL;
 
         rcvsiz = 0;
         zero(rcvbuf);