core: return 0 from device_serialize()

Fixes:

  CC       src/core/libsystemd_core_la-device.lo
src/core/device.c: In function 'device_serialize':
src/core/device.c:169:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

diff --git a/src/core/device.c b/src/core/device.c
index 63bae978a6223bb4c06072b0d758b653569ff02f..19b688df555069e757b45f36a74c69c2bb6d541e 100644 (file)
--- a/src/core/device.c
+++ b/src/core/device.c
@@ -166,6 +166,8 @@ static int device_serialize(Unit *u, FILE *f, FDSet *fds) {
         assert(fds);
 
         unit_serialize_item(u, f, "state", device_state_to_string(d->state));
+
+        return 0;
 }
 
 static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {