[Bug 753817] subparse: SIGSEGV with abnormal file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753817

--- Comment #1 from Eunhae Choi <eunhae1.choi at samsung.com> ---
Created attachment 309570
  --> https://bugzilla.gnome.org/attachment.cgi?id=309570&action=edit
subparse: add initializing code of err

If a error is occurred in convert function with detected_encoding, the 'err'
should be set to NULL after free().

Even if the converting succeed at the second time, it is handled as an error
because the 'err' is not NULL. And it causes invalid pointer access.

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