truemotion1: fix leaking frame on init failure

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

libavcodec/truemotion1.c

@@ -489,8 +489,10 @@ static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
     /* there is a vertical predictor for each pixel in a line; each vertical
      * predictor is 0 to start with */
     av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
-    if (!s->vert_pred)
+    if (!s->vert_pred) {
+        av_frame_free(&s->frame);
         return AVERROR(ENOMEM);
+    }
 
     return 0;
 }