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libip: don't reject ipmask in v6 form for v4 address

--- a/sys/src/libip/parseip.c

+++ b/sys/src/libip/parseip.c

@@ -156,7 +156,7 @@

 		x = parseip(to, from);

 		if(memcmp(to, v4prefix, IPv4off) == 0)

 			memset(to, 0xff, IPv4off);

-		else if(v4)

+		else if(v4 && memcmp(to, IPallbits, IPv4off) != 0)

 			x = -1;

 	}

 	return x;