Move scsi_release_buffers() call so that buffers are retained until
after a determination is made about whether the command will be
requeued via scsi_queue_insert().  Doing so allows a command which
receives DID_RESET to be immediately queued to the driver using
the original scsi_cmnd, thus retaining it's original jiffies_at_alloc.

Signed-off-by: Michael Reed <mdr@sgi.com>