avcodec/vorbisdec: use av_freep(), do not leave stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/vorbisdec.c

@@ -196,7 +196,7 @@ static void vorbis_free(vorbis_context *vc)
 
     if (vc->residues)
         for (i = 0; i < vc->residue_count; i++)
-            av_free(vc->residues[i].classifs);
+            av_freep(&vc->residues[i].classifs);
     av_freep(&vc->residues);
     av_freep(&vc->modes);
 
@@ -205,7 +205,7 @@ static void vorbis_free(vorbis_context *vc)
 
     if (vc->codebooks)
         for (i = 0; i < vc->codebook_count; ++i) {
-            av_free(vc->codebooks[i].codevectors);
+            av_freep(&vc->codebooks[i].codevectors);
             ff_free_vlc(&vc->codebooks[i].vlc);
         }
     av_freep(&vc->codebooks);
@@ -213,21 +213,21 @@ static void vorbis_free(vorbis_context *vc)
     if (vc->floors)
         for (i = 0; i < vc->floor_count; ++i) {
             if (vc->floors[i].floor_type == 0) {
-                av_free(vc->floors[i].data.t0.map[0]);
-                av_free(vc->floors[i].data.t0.map[1]);
-                av_free(vc->floors[i].data.t0.book_list);
-                av_free(vc->floors[i].data.t0.lsp);
+                av_freep(&vc->floors[i].data.t0.map[0]);
+                av_freep(&vc->floors[i].data.t0.map[1]);
+                av_freep(&vc->floors[i].data.t0.book_list);
+                av_freep(&vc->floors[i].data.t0.lsp);
             } else {
-                av_free(vc->floors[i].data.t1.list);
+                av_freep(&vc->floors[i].data.t1.list);
             }
         }
     av_freep(&vc->floors);
 
     if (vc->mappings)
         for (i = 0; i < vc->mapping_count; ++i) {
-            av_free(vc->mappings[i].magnitude);
-            av_free(vc->mappings[i].angle);
-            av_free(vc->mappings[i].mux);
+            av_freep(&vc->mappings[i].magnitude);
+            av_freep(&vc->mappings[i].angle);
+            av_freep(&vc->mappings[i].mux);
         }
     av_freep(&vc->mappings);
 }