Remove double quotes, use curly braces where appropriate, and fix

the $BUSNAME device node path

tools/openbsd/detach

@@ -9,11 +9,11 @@ case $DEVCLASS in
 	ugen*)
 		BUSNAME=$(cat /var/run/${DEVNAME}.bus)
 		rm -f /var/run/${DEVNAME}.bus
-		chown root:wheel /dev/"$DEVNAME".* &&
+		chown root:wheel /dev/${DEVNAME}.* &&
-			chmod 600 /dev/"$DEVNAME".*
+			chmod 600 /dev/${DEVNAME}.*
 		test -n "$BUSNAME" && {
-			chown root:wheel /dev/"$BUSNAME" &&
+			chown root:wheel $BUSNAME &&
-				chmod 600 /dev/"$BUSNAME"
+				chmod 600 $BUSNAME
 		}
 		;;
 	esac