[PATCH 13/14] Fix ucs4le_internal_loop in error case.

[Stefan Liebler]

On 02/23/2016 06:41 PM, Joseph Myers wrote:
> If this is user-visible in a release, there should be a bug filed in
> Bugzilla (if there isn't one already open), and a testcase added to the
> testsuite.
>
okay.

I've filed the bug
"Bug 19726 - Converting UCS4LE to INTERNAL with iconv() does not update 
pointers and lengths in error-case."
(https://sourceware.org/bugzilla/show_bug.cgi?id=19726)

This patch also adds a new testcase for this issue.
The new test was tested on a s390, power, intel machine.

ChangeLog:

	[BZ #19726]
	* iconv/gconv_simple.c (ucs4le_internal_loop): Update inptrp and
	outptrp in case of an illegal input.
	* iconv/tst-iconv6.c: New file.
	* iconv/Makefile (tests): Add tst-iconv6.
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