cleanup error handling during suspend/resume of sd

[Oliver Neukum <oliver@xxxxxxxxxx>]

This series fixes an issue mostly seen with eSATA devices and
card readers. The errors don't arise on the SCSI level must
be processed and sorted for the generic code, so that issue
like recently disconnected devices don't impede system sleep.

Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
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