scsi: sr: Simplify the sr_open() function

Simplify the sr_open() by removing the goto label as the function only
returns one error code.
Signed-off-by: Enze Li <lienze@kylinos.cn>
Link: https://lore.kernel.org/r/20230327030237.3407253-1-lienze@kylinos.cnReviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sr.c

@@ -590,20 +590,15 @@ static int sr_open(struct cdrom_device_info *cdi, int purpose)
 {
 	struct scsi_cd *cd = cdi->handle;
 	struct scsi_device *sdev = cd->device;
-	int retval;
 
 	/*
 	 * If the device is in error recovery, wait until it is done.
 	 * If the device is offline, then disallow any access to it.
 	 */
-	retval = -ENXIO;
 	if (!scsi_block_when_processing_errors(sdev))
-		goto error_out;
+		return -ENXIO;
 
 	return 0;
-
-error_out:
-	return retval;	
 }
 
 static void sr_release(struct cdrom_device_info *cdi)