avcodec/decode: Fix incorrect enum type used in side_data_map()

It's AVPacketSideDataType, not AVFrameSideDataType.

Reviewed-by: Ted (Chromium) Meyer <tmathmeyer@chromium.org>
Reviewed-by: Marth64 <marth64@proxyid.net>
Signed-off-by: Marth64 <marth64@proxyid.net>
(cherry picked from commit e9c3698ed2)

libavcodec/decode.c

@@ -1466,8 +1466,8 @@ static int side_data_map(AVFrame *dst,
 
 {
     for (int i = 0; map[i].packet < AV_PKT_DATA_NB; i++) {
-        const enum AVFrameSideDataType type_pkt   = map[i].packet;
-        const enum AVFrameSideDataType type_frame = map[i].frame;
+        const enum AVPacketSideDataType type_pkt   = map[i].packet;
+        const enum AVFrameSideDataType  type_frame = map[i].frame;
         const AVPacketSideData *sd_pkt;
         AVFrameSideData *sd_frame;