Patch: fix cut & past problem on 64 bit platforms

[Stephen J. Turnbull]

Mike FABIAN writes:

 > Patch by Takashi IWAI and me.

Thanks for the patch!

 > For details please have a look at
 > 
 > http://bugzilla.novell.com/show_bug.cgi?id=244613

(1) As I understand it the crash is presumably caused by a buffer
overrun overwriting the stack, not in the codec trying to decode a
corrupt (truncated) selection string, right?  Ie, the problem leading
to a crash has been fixed here, it's not something in the codec that
is masked by giving it uncorrupt data?

(2) Now, this looks like a bug in the 64-bit X libraries to me.  What
happens if it gets fixed?