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devmouse: remove redundant check

--- a/sys/src/9/port/devmouse.c

+++ b/sys/src/9/port/devmouse.c

@@ -304,8 +304,6 @@

 	one = two = three = 0;

 	for(i = 0; i < 3; i++){

-		if(map[i] == 0)

-			error(Ebadarg);

 		if(map[i] == '1'){

 			if(one)

 				error(Ebadarg);