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;
             ^

1 files changed, 3 insertions, 3 deletions

diff --git a/src/shared/copy.c b/src/shared/copy.c
index 9e4c3b0f72..775a339856 100644
--- a/src/shared/copy.c
+++ b/src/shared/copy.c
@@ -360,7 +360,7 @@ int copy_file_fd(const char *from, int fdt, bool try_reflink) {
 }
 
 int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) {
-        int fdt, r;
+        int fdt = -1, r;
 
         assert(from);
         assert(to);
@@ -390,7 +390,7 @@ int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned
 }
 
 int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) {
-        _cleanup_free_ char *t;
+        _cleanup_free_ char *t = NULL;
         int r;
 
         assert(from);
@@ -421,7 +421,7 @@ int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace
 int copy_times(int fdf, int fdt) {
         struct timespec ut[2];
         struct stat st;
-        usec_t crtime;
+        usec_t crtime = 0;
 
         assert(fdf >= 0);
         assert(fdt >= 0);