Make the logic visible for FlexeLint

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2029 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/shmlog.c

@@ -178,9 +178,9 @@ WSL_Flush(struct worker *w)
 	unsigned char *p;
 	unsigned l;
 
-	if (w->wlp == w->wlog)
-		return;
 	l = pdiff(w->wlog, w->wlp);
+	if (l == 0)
+		return;
 	LOCKSHM(&vsl_mtx);
 	VSL_stats->shm_writes++;
 	VSL_stats->shm_records += w->wlr;