libmix: let the decoder resume instead of stopping if vol is corrupted

BZ: 163232

let the decoder resume instead of stopping if vol is corrupted
and cause vop height & width 0

Change-Id: I81d11d638855fe91da1301a03a1bc5afbf3fca6a
Signed-off-by: ywan171 <yi.a.wang@intel.com>
diff --git a/videodecoder/VideoDecoderMPEG4.cpp b/videodecoder/VideoDecoderMPEG4.cpp
index 939e563..7f2151b 100644
--- a/videodecoder/VideoDecoderMPEG4.cpp
+++ b/videodecoder/VideoDecoderMPEG4.cpp
@@ -150,7 +150,7 @@
     // and return error to OMX to avoid mediaserver crash.
     if (data->picture_data && (data->picture_data->picture_param.vop_width == 0
         || data->picture_data->picture_param.vop_height == 0)) {
-        return DECODE_FAIL;
+        return DECODE_PARSER_FAIL;
     }
 
     uint64_t lastPTS = mCurrentPTS;