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, 1 insertions, 1 deletions

diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index 3a6faa273d..46653189fb 100644
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -975,7 +975,7 @@ static int link_lldp_status(int argc, char *argv[], void *userdata) {
                                                 return r;
 
                                 } else if (streq(a, "_TTL")) {
-                                        long long unsigned x;
+                                        long long unsigned x = 0;
                                         usec_t time;
 
                                         r = safe_atollu(b, &x);