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libdraw: avoid printing error on closemouse()

--- a/sys/src/libdraw/mouse.c

+++ b/sys/src/libdraw/mouse.c

@@ -52,6 +52,8 @@

 		n = read(mc->mfd, buf, sizeof buf);

 		if(n != 1+4*12){

 			yield();	/* if error is due to exiting, we'll exit here */

+			if(mc->mfd < 0)

+				break;

 			fprint(2, "mouse: bad count %d not 49: %r\n", n);

 			if(n<0 || ++nerr>10)

 				threadexits("read error");

-- 

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