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libmach: fix acid -k regression (was broken in r5eeb36d3ddd0)

--- a/sys/src/libmach/map.c

+++ b/sys/src/libmach/map.c

@@ -89,11 +89,13 @@

 	map = newmap(0, 4);

 	if (!map)

 		return 0;

-	if(kflag)

+	if(kflag) {

 		regs = "kregs";

-	else

+		mode = OREAD;

+	} else {

 		regs = "regs";

-	mode = ORDWR;

+		mode = ORDWR;

+	}

 	if (mach->regsize) {

 		sprint(buf, "/proc/%d/%s", pid, regs);

 		fd = open(buf, mode);

-- 

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