Assert non-null first

git-svn-id: http://www.varnish-cache.org/svn/trunk@330 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/storage_file.c

@@ -483,9 +483,9 @@ smf_alloc(struct stevedore *st, size_t size)
 	size &= ~(sc->pagesize - 1);
 	AZ(pthread_mutex_lock(&sc->mtx));
 	smf = alloc_smf(sc, size);
-	assert(smf->size == size);
 	AZ(pthread_mutex_unlock(&sc->mtx));
 	assert(smf != NULL);
+	assert(smf->size == size);
 	smf->s.space = size;
 	smf->s.priv = smf;
 	smf->s.ptr = smf->ptr;