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 --git a/drivers/scsi/scsi_logging.h b/drivers/scsi/scsi_logging.h
index 1f65139..7fe64a8 100644
--- a/drivers/scsi/scsi_logging.h
+++ b/drivers/scsi/scsi_logging.h
@@ -51,6 +51,7 @@
 		} while (0);					\
 } while (0)
 #else
+#define SCSI_LOG_LEVEL(SHIFT, BITS) 0
 #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD)
 #endif /* CONFIG_SCSI_LOGGING */