fix hls muxer Segmentation fault.

wenjie.zhao
Commit efe3050d7a67e046eb3e1f8f783ca90e937cc3cb efe3050d 1 parent 73f13dfc
trunk/src/app/srs_app_hls.cpp
--- a/trunk/src/app/srs_app_hls.cpp
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+++ b/trunk/src/app/srs_app_hls.cpp
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@@ -731,6 +731,8 @@ int SrsHlsCache::write_audio(SrsAvcAacCodec* codec, SrsHlsMuxer* muxer, int64_t 
         }
     }
 
+     // cache->audio will be free in flush_audio
+     // so we must check whether it's null ptr.
     if (!cache->audio) {
         return ret;
     }