ffplay: clear pkt_temp when pkt is freed.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Marton Balint <cus@passwd.hu>
(cherry picked from commit efe8a1ba08)

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

ffplay.c

@@ -2145,6 +2145,7 @@ static int audio_decode_frame(VideoState *is, double *pts_ptr)
         /* free the current packet */
         if (pkt->data)
             av_free_packet(pkt);
+        memset(pkt_temp, 0, sizeof(*pkt_temp));
 
         if (is->paused || is->audioq.abort_request) {
             return -1;