dell_flash_unlock: Set iopl level back to 0 when done

Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>

util/dell-flash-unlock/dell_flash_unlock.c

@@ -96,6 +96,7 @@ main(int argc, char *argv[])
 				"You can now shutdown the system.\n");
 		}
 	}
+	sys_iopl(0);
 	return errno;
 }