add more error checking to open of /dev/dsp* and /dev/audio* - if the default format for the chosen subdevice cannot be obtained return an error instead of returning success with an indeteterminate format selected.
add more error checking to open of /dev/dsp* and /dev/audio* - if the
default format for the chosen subdevice cannot be obtained return an error
instead of returning success with an indeteterminate format selected.

note that this should never happen once the feederchain builder works for
recording.

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