On grub_strchr implementation

[BVK]

hi,


As per http://www.opengroup.org/onlinepubs/009695399/functions/strchr.html
strchr method should consider '\0' as part of the string, which means,
strchr should return '\0' character position when it is passed as the
character to look for.

I believe, grub_strchr is intended to mimic standard strchr semantics,
but its implementation doesn't confrom the above requirement.  Same
goes for grub_strrchr function too.  Attached is the patch to fix both
of these.


thanks,
-- 
bvk-chaitanya

fix-strchar.patch
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