[Bug 783760] wavparse: Processing wav file with blanck tag in metadata causes SIGSEGV

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783760

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 353709
  --> https://bugzilla.gnome.org/attachment.cgi?id=353709&action=edit
wavparse: Actually clip to upstream size instead of size of the data chunk

There might be other chunks after the data chunk, so clipping the chunk
size with the data size can lead to a negative number and all following
calculations go wrong and cause crashes or worse.

This was introduced in 3ac119bbe2c360e28c087cf3852ea769d611b120.

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