Fixes from static analysis
Ref https://www.riscosopen.org/forum/forums/4/topics/9503#posts-72595 and subsequent offline checks. arp: missing return from non-void delete() (from FreeBSD 13977) ifconfig: undefined variable m (from FreeBSD revision 13145) correct return types to void for xxx_getaddr() (from FreeBSD revision 19914) inetstat: dead array variable buf2 removed ipvars: missing return value from main() map-mbone: missing va_end (from NetBSD revision 1.8) md5: file handle leak on error (from FreeBSD revision 292955) mrinfo: missing va_end (from NetBSD revision 1.12) mtrace: missing va_end (from NetBSD revision 1.18) newfiler: add comment for apparent missing return sysctl: fix QUAD variable type (from FreeBSD revision 88696) though academic since Internet doesn't have any quad_t variables explicit function return types added in PathConf.c BootNet: change RMIfThere alias to use temporary variable from its own namespace Version 5.61. Tagged as 'Internet-5_61'
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