Refactor local variables in stvfe_mutate()

src/fellow_storage.c

@@ -1599,6 +1599,8 @@ stvfe_sumstat(struct worker *wrk)
 int
 stvfe_mutate(struct worker *wrk, struct objcore *oc)
 {
+	const struct stevedore *stv;
+	const struct stvfe *stvfe;
 	struct objhead *oh;
 	int retval = 0;
 
@@ -1610,8 +1612,8 @@ stvfe_mutate(struct worker *wrk, struct objcore *oc)
 
 	if (oc->refcnt == 1 && !Lck_Trylock(&oh->mtx)) {
 		if (oc->refcnt == 1) {
-			const struct stevedore *stv = oc_stv(wrk, oc);
-			const struct stvfe *stvfe = stv_stvfe(stv);
+			stv = oc_stv(wrk, oc);
+			stvfe = stv_stvfe(stv);
 
 			assert_memstv(stvfe, stv);
 			AN(oc->stobj->priv);