Include all possible DRM device paths

Currently, DRM_DEVICE_PATH=/sys/class/graphics/fb0/device/drm/card0
is hard-coded. However, on some systems, this specific path may not
exist (for example, I have /sys/class/graphics/fb0/device/drm/card1
and /sys/class/graphics/fb1/device/drm/card0), causing the entire
script to fail. To prevent this, replace the hard-coded “0”s by
globs.

enforce-dpms.sh

@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 set -ueo pipefail
 
-DRM_DEVICE_PATH=/sys/class/graphics/fb0/device/drm/card0
+DRM_DEVICE_PATH=/sys/class/graphics/fb*/device/drm/card*
 ALL_DRM_PORTS=$(find ${DRM_DEVICE_PATH} | grep '/dpms$')
 DEBUG=0