[RFC][PATCH]BZ#2337 Fix for spurious free of user buffer on fclose with wide char orientation.

[Ryan S. Arnold]

RFC regarding bugzilla 2337 -libio in wide mode deallocates user
supplied buffer:

http://sources.redhat.com/bugzilla/show_bug.cgi?id=2337#c4

Please comment on the attached patch, which is also included in the
bugzilla.

I have an orthogonal concern.  I'm not sure the _IO_wsetb() function
should be setting/unsetting the _IO_USER_BUF flag since wide-char
oriented IO operations don't make use of the user supplied buffer
(provided via setvbuf).

Ryan S. Arnold
IBM Linux Technology Center
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