scsi: sim710: Remove unused variable 'err' from sim710_init()

Take the opportunity to rework the comment a little.

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/sim710.c: In function ‘sim710_init’:
 drivers/scsi/sim710.c:216:6: warning: variable ‘err’ set but not used [-Wunused-but-set-variable]

Link: https://lore.kernel.org/r/20210317091125.2910058-6-lee.jones@linaro.org
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Richard Hirst <richard@sleepie.demon.co.uk>
Cc: c by <James.Bottomley@SteelEye.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sim710.c

@@ -213,21 +213,19 @@ static struct eisa_driver sim710_eisa_driver = {
 
 static int __init sim710_init(void)
 {
-	int err = -ENODEV;
-
 #ifdef MODULE
 	if (sim710)
 		param_setup(sim710);
 #endif
 
 #ifdef CONFIG_EISA
-	err = eisa_driver_register(&sim710_eisa_driver);
+	/*
+	 * FIXME: We'd really like to return -ENODEV if no devices have actually
+	 * been found.  However eisa_driver_register() only reports problems
+	 * with kobject_register() so simply return success for now.
+	 */
+	eisa_driver_register(&sim710_eisa_driver);
 #endif
-	/* FIXME: what we'd really like to return here is -ENODEV if
-	 * no devices have actually been found.  Instead, the err
-	 * above actually only reports problems with kobject_register,
-	 * so for the moment return success */
-
 	return 0;
 }