ivi_common: Make sure color planes have been initialized

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit a92538b7c0)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/ivi_common.c

@@ -938,6 +938,11 @@ int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
         return AVERROR_PATCHWELCOME;
     }
 
+    if (!ctx->planes[0].bands) {
+        av_log(avctx, AV_LOG_ERROR, "Color planes not initialized yet\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     ctx->switch_buffers(ctx);
 
     //{ START_TIMER;