scsi: simplify scsi_log_(send|completion)

Simplify scsi_log_(send|completion) by externalizing
scsi_mlreturn_string() and always print the command address.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --cc drivers/scsi/constants.c
Simple merge

diff --cc drivers/scsi/scsi.c
Simple merge

diff --cc drivers/scsi/scsi_lib.c
Simple merge

diff --cc drivers/scsi/scsi_logging.h
Simple merge

diff --cc include/scsi/scsi_dbg.h
Simple merge