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libip: use snprint() in myetheraddr() to prevent accidents

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

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

@@ -9,9 +9,9 @@

 	char buf[256];

 	if(*dev == '/' || *dev == '#')

-		sprint(buf, "%s/addr", dev);

+		snprint(buf, sizeof buf, "%s/addr", dev);

 	else

-		sprint(buf, "/net/%s/addr", dev);

+		snprint(buf, sizeof buf, "/net/%s/addr", dev);

 	fd = open(buf, OREAD);

 	if(fd < 0)