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devmouse: fix off-by-one in mouseread() (thanks Sören)

--- a/kern/devmouse.c

+++ b/kern/devmouse.c

@@ -122,7 +122,7 @@

 long

 mouseread(Chan *c, void *va, long n, vlong offset)

 {

-	char buf[4*12+1];

+	char buf[1+4*12+1];

 	Mousestate m;

 	uchar *p;

 	int b;