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srv: be nice, close the previously duped pipe filedescriptor

--- a/sys/src/cmd/srv.c

+++ b/sys/src/cmd/srv.c

@@ -51,6 +51,7 @@

 		rfork(RFNOTEG);

 		dup(p[0], 0);

 		dup(p[0], 1);

+		close(p[0]);

 		close(p[1]);

 		execl("/bin/rc", "rc", "-c", cmd, nil);

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

-- 

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