qpaeq: Try to load equalizer module before failing, better error messages
This fixes bug 38728 [1]. When equalizer features are unavailable in running
pulseaudio daemon, try to load relevant module. If this fails, following error
is printed on stderr instead of a confusing traceback:
It seems that running pulseaudio does not support equalizer features and
loading module-equalizer-sink module failed. Exiting...