mimic: Always return on failure

Bug-Id: 905
CC: libav-stable@libav.org
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/mimic.c

@@ -431,11 +431,10 @@ static int mimic_decode_frame(AVCodecContext *avctx, void *data,
     res = decode(ctx, quality, num_coeffs, !is_pframe);
     ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0);
     if (res < 0) {
-        if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
+        if (!(avctx->active_thread_type & FF_THREAD_FRAME))
             ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
         return res;
     }
-    }
 
     if ((res = av_frame_ref(data, ctx->frames[ctx->cur_index].f)) < 0)
         return res;