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libc: cleanup hangup() function (avoid duplicated literal string)

--- a/sys/src/libc/port/hangup.c

+++ b/sys/src/libc/port/hangup.c

@@ -8,5 +8,6 @@

 int

 hangup(int ctl)

 {

-	return write(ctl, "hangup", sizeof("hangup")-1) != sizeof("hangup")-1;

+	static char msg[] = "hangup";

+	return write(ctl, msg, sizeof(msg)-1) != sizeof(msg)-1;

 }

-- 

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