hwcontext_vulkan: free temporary array once unneeded

Fixes a small memory leak.
This also prevents leaks on malloc/mutex init errors.

libavutil/hwcontext_vulkan.c

@@ -1427,24 +1427,31 @@ static int vulkan_device_init(AVHWDeviceContext *ctx)
     vk->GetPhysicalDeviceQueueFamilyProperties(hwctx->phys_dev, &qf_num, qf);
 
     p->qf_mutex = av_calloc(qf_num, sizeof(*p->qf_mutex));
-    if (!p->qf_mutex)
+    if (!p->qf_mutex) {
+        av_free(qf);
         return AVERROR(ENOMEM);
+    }
     p->nb_tot_qfs = qf_num;
 
     for (uint32_t i = 0; i < qf_num; i++) {
         p->qf_mutex[i] = av_calloc(qf[i].queueCount, sizeof(**p->qf_mutex));
-        if (!p->qf_mutex[i])
+        if (!p->qf_mutex[i]) {
+            av_free(qf);
             return AVERROR(ENOMEM);
+        }
         for (uint32_t j = 0; j < qf[i].queueCount; j++) {
             err = pthread_mutex_init(&p->qf_mutex[i][j], NULL);
             if (err != 0) {
                 av_log(ctx, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n",
                        av_err2str(err));
+                av_free(qf);
                 return AVERROR(err);
             }
         }
     }
 
+    av_free(qf);
+
     graph_index = hwctx->queue_family_index;
     comp_index  = hwctx->queue_family_comp_index;
     tx_index    = hwctx->queue_family_tx_index;