lavfi/buffersink: fix possible leaks after allocation failures.

Should fix Coverity CID 1005313, 1005314, 1005315.

libavfilter/buffersink.c

@@ -401,8 +401,10 @@ static int vsink_query_formats(AVFilterContext *ctx)
     CHECK_LIST_SIZE(pixel_fmts)
     if (buf->pixel_fmts_size) {
         for (i = 0; i < NB_ITEMS(buf->pixel_fmts); i++)
-            if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0)
+            if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0) {
+                ff_formats_unref(&formats);
                 return ret;
+            }
         ff_set_common_formats(ctx, formats);
     } else {
         ff_default_query_formats(ctx);
@@ -443,19 +445,25 @@ static int asink_query_formats(AVFilterContext *ctx)
 
     if (buf->sample_fmts_size) {
         for (i = 0; i < NB_ITEMS(buf->sample_fmts); i++)
-            if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0)
+            if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0) {
+                ff_formats_unref(&formats);
                 return ret;
+            }
         ff_set_common_formats(ctx, formats);
     }
 
     if (buf->channel_layouts_size || buf->channel_counts_size ||
         buf->all_channel_counts) {
         for (i = 0; i < NB_ITEMS(buf->channel_layouts); i++)
-            if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0)
+            if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0) {
+                ff_channel_layouts_unref(&layouts);
                 return ret;
+            }
         for (i = 0; i < NB_ITEMS(buf->channel_counts); i++)
-            if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0)
+            if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0) {
+                ff_channel_layouts_unref(&layouts);
                 return ret;
+            }
         if (buf->all_channel_counts) {
             if (layouts)
                 av_log(ctx, AV_LOG_WARNING,
@@ -469,8 +477,10 @@ static int asink_query_formats(AVFilterContext *ctx)
     if (buf->sample_rates_size) {
         formats = NULL;
         for (i = 0; i < NB_ITEMS(buf->sample_rates); i++)
-            if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0)
+            if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0) {
+                ff_formats_unref(&formats);
                 return ret;
+            }
         ff_set_common_samplerates(ctx, formats);
     }