All callers of static method load_nvlist() in spa.c handles error case,
so there is no reason to assert that we won't hit an error.  Instead,
just return that error to caller and have the upper layer handle it.

Obtained from:	FreeNAS
Reported by:	rodrigc
Reviewed by:	Matthew Ahrens
MFC after:	2 weeks
Add the USB EHCI flags required for the post-AR71xx devices.

Tested:

* DB120, AR9344
ufs: small formatting fixes.

Cleanup some extra space.
Use of tabs vs. spaces.
No functional change.

MFC after:	3 days
Reviewed by:	mckusick