qht: simplify qht_reset_size

Sometimes gcc doesn't pick up the fact that 'new' is properly
set if 'resize == true', which may generate an unnecessary
build warning.

Fix it by removing 'resize' and directly checking that 'new'
is non-NULL.
Signed-off-by: NEmilio G. Cota <cota@braap.org>
Message-Id: <1475706880-10667-2-git-send-email-cota@braap.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

util/qht.c

@@ -410,10 +410,9 @@ void qht_reset(struct qht *ht)
 
 bool qht_reset_size(struct qht *ht, size_t n_elems)
 {
-    struct qht_map *new;
+    struct qht_map *new = NULL;
     struct qht_map *map;
     size_t n_buckets;
-    bool resize = false;
 
     n_buckets = qht_elems_to_buckets(n_elems);
 
@@ -421,18 +420,17 @@ bool qht_reset_size(struct qht *ht, size_t n_elems)
     map = ht->map;
     if (n_buckets != map->n_buckets) {
         new = qht_map_create(n_buckets);
-        resize = true;
     }
 
     qht_map_lock_buckets(map);
     qht_map_reset__all_locked(map);
-    if (resize) {
+    if (new) {
         qht_do_resize(ht, new);
     }
     qht_map_unlock_buckets(map);
     qemu_mutex_unlock(&ht->lock);
 
-    return resize;
+    return !!new;
 }
 
 static inline