Mike Barcroft e37f8b5313 Optimize errstr() by reducing the number of times it walks a string.
As a side effect, it makes the code easier to read and requires less
pointer arithmetic.

Test by:	strerror regression test
Submitted by:	Tim Kientzle <kientzle@acm.org>
2003-01-03 16:44:42 +00:00
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