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

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

libavcodec/cavs.c

@@ -822,16 +822,16 @@ av_cold int ff_cavs_end(AVCodecContext *avctx)
     av_frame_free(&h->DPB[0].f);
     av_frame_free(&h->DPB[1].f);
 
-    av_free(h->top_qp);
-    av_free(h->top_mv[0]);
-    av_free(h->top_mv[1]);
-    av_free(h->top_pred_Y);
-    av_free(h->top_border_y);
-    av_free(h->top_border_u);
-    av_free(h->top_border_v);
-    av_free(h->col_mv);
-    av_free(h->col_type_base);
-    av_free(h->block);
+    av_freep(&h->top_qp);
+    av_freep(&h->top_mv[0]);
+    av_freep(&h->top_mv[1]);
+    av_freep(&h->top_pred_Y);
+    av_freep(&h->top_border_y);
+    av_freep(&h->top_border_u);
+    av_freep(&h->top_border_v);
+    av_freep(&h->col_mv);
+    av_freep(&h->col_type_base);
+    av_freep(&h->block);
     av_freep(&h->edge_emu_buffer);
     return 0;
 }