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plan9: udp: move reopening to netdial()

--- a/plan9.c

+++ b/plan9.c

@@ -249,10 +249,25 @@

 }

 static void

+midiopen(void)

+{

+	if (midi >= 0) {

+		close(midi);

+		midi = -1;

+	}

+	if (midi < 0 && (midi = open(midipath, OWRITE)) < 0) {

+		fprint(2, "midi failed: %r\n");

+		/* FIXME display error */

+	}

+}

+

+static void

 netdial(void)

 {

-	if (udp >= 0)

+	if (udp >= 0) {

 		close(udp);

+		udp = -1;

+	}

 	if (udp < 0 && (udp = dial(netmkaddr(ip, "udp", udpport), nil, nil, nil)) < 0) {

 		fprint(2, "udp failed: %r\n");

 		/* FIXME display error */

@@ -308,8 +323,6 @@

 		else if (strcmp(s, "ip") == 0) {

 			free(ip);

 			ip = strdup(a);

-			close(udp);

-			udp = -1;

 			netdial();

 		}