[PATCH] Mangle NULL pointers in iconv/gconv [BZ #22025]

[Florian Weimer]

We have been carrying the attached patch for a while.

There is no test because triggering this failure is very hard even on 32
bit.

Based on my review, it fixes all NULL pointer inconsistencies except the
mangling of __end_fct after a gconv_init failure.  While writing a test
for this omission I found a heap corruption, so I filed a separate bug
for these remaining issues:

  <https://sourceware.org/bugzilla/show_bug.cgi?id=22026>

Thanks,
Florian
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