small patch to hdaps-gl

[Pascal d'Hermilly]

I've made a small usability patch for hdaps-gl.

Before, if hdaps module wasn't loaded in kernel the errormessage was:
    open: No such file or directory
Now:
    Could not read file: /sys/devices/platform/hdaps/position
    Try 'modprobe hdaps' or 'modprobe hdaps_ec'

I hope this will be patched and shipped.
Best regards

Pascal
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