remove testing that overwrote disk with junk

Reference: /n/atom/patch/applied/iopssafe
Date: Tue Apr  1 17:09:42 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/disk/iops.c	Tue Apr  1 17:09:37 2014
+++ /sys/src/cmd/disk/iops.c	Tue Apr  1 17:09:38 2014
@@ -127,8 +127,12 @@
 			pwrite(fd, buf, ss, byte0 + lba*ss);
 			if(trace['w'])
 				print("read lba %lld\n", lba);
-uvlong *v = (uvlong*)buf;
-for(i = 0; i < ss/8; i+=1024)v[i]=lba ^ i;
+			if(0){
+				uvlong *v;
+
+				for(i = 0; i < ss/8; i+=1024)
+					v[i]=lba ^ i;
+			}
 			iops[1]++;
 			bytes[1] += ss;
 			break;