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/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index 2634a730d6..a0a2320efa 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -775,7 +775,7 @@ int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message,
                 if (pool_offset >= 0 &&
                     server->bound_leases[pool_offset] == existing_lease) {
                         DHCPLease *lease;
-                        usec_t time_now;
+                        usec_t time_now = 0;
 
                         if (!existing_lease) {
                                 lease = new0(DHCPLease, 1);