avcodec/proresenc_anatoliy: Check av_frame_alloc() return code

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

libavcodec/proresenc_anatoliy.c

@@ -591,6 +591,8 @@ static av_cold int prores_encode_init(AVCodecContext *avctx)
     }
 
     avctx->coded_frame = av_frame_alloc();
+    if (!avctx->coded_frame)
+        return AVERROR(ENOMEM);
     avctx->coded_frame->key_frame = 1;
     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;