[PATCH] Fix crashes on invalid input in IBM gconv modules [BZ #17325]

[Florian Weimer]

These changes are based on the fix for BZ #14134 in commit 
6e230d11837f3ae7b375ea69d7905f0d18eb79e5.  My analysis showed that the 
0xffff case was impossible with certain character sets, so I added 
asserts there.

Tested on master with no failures.

I will request CVE IDs (for this fix and the 2012 commit) on oss-security.

-- 
Florian Weimer / Red Hat Product Security
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