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ip/ipconfig: use ewrite() to enable routing command for sendra

--- a/sys/src/cmd/ip/ipconfig/ipv6.c

+++ b/sys/src/cmd/ip/ipconfig/ipv6.c

@@ -1124,17 +1124,12 @@

 static void

 startra6(void)

 {

-	static char routeon[] = "iprouting 1";

-

 	if(conf.recvra > 0)

 		recvra6();

 	dolog = 1;

 	if(conf.sendra > 0) {

-		if(write(conf.cfd, routeon, sizeof routeon - 1) < 0) {

-			warning("write (%s) failed: %r", routeon);

-			return;

-		}

+		ewrite(conf.cfd, "iprouting 1");

 		sendra6();

 		if(conf.recvra <= 0)

 			recvra6();