[core] fix stat_cache initialization error

fix stat_cache initialization error (coverity identified memory leak)
  (bug introduced when moving stat_cache_init code from server.c to
   stat_cache.c)

quell insignificant coverity warning in mod_extforward

src/mod_extforward.c

@@ -1603,6 +1603,7 @@ static int mod_extforward_network_read (server *srv, connection *con,
       case -2: log_error_write(srv, __FILE__, __LINE__, "s",
                                "hap-PROXY proto received "
                                "invalid/unsupported request");
+               /* fall through */
       default: rc = -1; break;
     }
 

src/stat_cache.c

@@ -129,18 +129,19 @@ stat_cache *stat_cache_init(server *srv) {
 #ifdef HAVE_FAM_H
 	/* setup FAM */
 	if (srv->srvconf.stat_cache_engine == STAT_CACHE_ENGINE_FAM) {
-		if (0 != FAMOpen2(&srv->stat_cache->fam, "lighttpd")) {
+		if (0 != FAMOpen2(&sc->fam, "lighttpd")) {
 			log_error_write(srv, __FILE__, __LINE__, "s",
 					"could not open a fam connection, dieing.");
+			free(sc);
 			return NULL;
 		}
 #ifdef HAVE_FAMNOEXISTS
-		FAMNoExists(&srv->stat_cache->fam);
+		FAMNoExists(&sc->fam);
 #endif
 
-		fd_close_on_exec(FAMCONNECTION_GETFD(&srv->stat_cache->fam));
-		fdevent_register(srv->ev, FAMCONNECTION_GETFD(&srv->stat_cache->fam), stat_cache_handle_fdevent, NULL);
-		fdevent_event_set(srv->ev, &(srv->stat_cache->fam_fcce_ndx), FAMCONNECTION_GETFD(&srv->stat_cache->fam), FDEVENT_IN);
+		fd_close_on_exec(FAMCONNECTION_GETFD(&sc->fam));
+		fdevent_register(srv->ev, FAMCONNECTION_GETFD(&sc->fam), stat_cache_handle_fdevent, NULL);
+		fdevent_event_set(srv->ev, &(sc->fam_fcce_ndx), FAMCONNECTION_GETFD(&sc->fam), FDEVENT_IN);
 	}
 #endif