Add missing newline to message about requiring root privileges

This will help ensure that scripts/parsers don't get confused when the message
is printed out

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

tools/regression/sockets/so_setfib/so_setfib.c

@@ -171,7 +171,7 @@ main(int argc __unused, char *argv[] __unused)
 	size_t s;
 
 	if (geteuid() != 0) {
-		printf("1..0 # SKIP: must be root");
+		printf("1..0 # SKIP: must be root\n");
 		return (0);
 	}