Release the reference to the peripheral if returning a error. That reference is to be held only if daopen() has been successful and until daclose() releases it.  daclose() won't be called if daopen() has failed, though.
Release the reference to the peripheral if returning a error.
That reference is to be held only if daopen() has been successful
and until daclose() releases it.  daclose() won't be called if
daopen() has failed, though.

Approved by:	re, njl
MFC after:	1 week

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