[PATCH] fix some warning

[Steven Munroe]

This patch fixes some of the warning I see with gcc-3.3 of the nature 
<warning: comparison between signed and unsigned>. There are many of 
these that may obscure more important warnings (like pointer to int 
casts). So I thought I would start chipping away some of the simpler cases.

2003-05-07  Steven Munroe <sjmunroe@us.ibm.com>

	* nss/nss_files/files-netgrp.c (_nss_netgroup_parseline): Cast
	pointer difference to size_t for comparison.
	* resolv/ns_print.c (ns_sprintrrf): Change siz type to size_t.
	* resolv/nss_dns/dns-network.c (getanswer_r): Cast char
	difference to unsigned for comparison.
	* time/strptime.c (strptime_internal): Change val type to
	size_t.
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