add regex

examples/simple/scripts/LAST/50-misc

@@ -12,7 +12,7 @@ if grep -q active /proc/mdstat 2>/dev/null; then
     fi
 fi
 
-usedm=$(dmsetup ls | egrep -v '^live-rw|^live-base' | wc -l)
+usedm=$(dmsetup ls | egrep -v '^live-rw|^live-base|^No devices found' | wc -l)
 if [ $usedm -ne 0 ]; then
     if [ ! -d $target/etc/lvm ]; then
 	echo ERROR: Found lvm devices, but the lvm2 package was not installed