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mp4read_open: add check for failed frame buffer allocation

Fixes the first part of #49, thanks @jinhojun.

--- a/frontend/mp4read.c

+++ b/frontend/mp4read.c

@@ -1002,8 +1002,10 @@

     }

     // alloc frame buffer

-    // fixme: error checking

     mp4config.bitbuf.data = malloc(mp4config.frame.maxsize);

+

+    if (!mp4config.bitbuf.data)

+        goto err;

     if (mp4config.verbose.header)

     {