[Patch] Bug 22392 - __dfsw_strchr( ..., '\0' ) gives wrong answer.

[Wookhyun Han via llvm-commits]

__dfsw_strchr does not correctly handle when the character argument is
terminating character '\0'.

Originally, strchr function handles the case to return the address of the
end of the string.

However, __dfsw_strchr returns null pointer for the case.

Corresponding bug report: https://bugs.llvm.org/show_bug.cgi?id=22392
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