scsi: core: Rename status_byte to sg_status_byte

The next patch adds a helper status_byte function that works like
host_byte, so this patch renames the old status_byte to sg_status_byte
since it's only used for SG IO.

Signed-off-by: Mike Christie <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Chaitanya Kulkarni <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/scsi_ioctl.c

···
 	 * fill in all the output members
 	 */
 	hdr->status = scmd->result & 0xff;
-	hdr->masked_status = status_byte(scmd->result);
+	hdr->masked_status = sg_status_byte(scmd->result);
 	hdr->msg_status = COMMAND_COMPLETE;
 	hdr->host_status = host_byte(scmd->result);
 	hdr->driver_status = 0;

drivers/scsi/sg.c

···
 		struct scsi_sense_hdr sshdr;
 
 		srp->header.status = 0xff & result;
-		srp->header.masked_status = status_byte(result);
+		srp->header.masked_status = sg_status_byte(result);
 		srp->header.msg_status = COMMAND_COMPLETE;
 		srp->header.host_status = host_byte(result);
 		srp->header.driver_status = driver_byte(result);

include/scsi/sg.h

···
 #define TASK_ABORTED         0x20
 
 /* Obsolete status_byte() declaration */
-#define status_byte(result) (((result) >> 1) & 0x7f)
+#define sg_status_byte(result) (((result) >> 1) & 0x7f)
 
 typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */
     int host_no;        /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */