Bug in MIPS strncpy

[Perry McFarlane]

I found a bug in the MIPS-optimized strncpy
(newlib/libc/machine/mips/strncpy.c)
There is an unrolled loop to read from the source string 4 bytes at a
time, but this could read past the \0 and cause a SEGV.

The MIPS-optimized strncpy was added as part of this patch:
http://sourceware.org/ml/newlib/2001/msg00594.html

I suppose that it could be fixed by only reading groups of 4 bytes that
are word-alligned.
-- 
  Perry McFarlane
  perry_m@fastmail.fm

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