qlogicpti: Return correct error code

The return value of of_ioremap on failure should be -ENODEV and not
-1.

Found using Coccinelle. A simplified version of the semantic patch
used is:

//<smpl>
@@
expression *e;
@@

e = of_ioremap(...);
if (e == NULL) {
...
return
- -1
+ -ENODEV
;
}
//</smpl>

The single call site only checks that the return value is less than 0,
hence no change is required at the call site.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qlogicpti.c

@@ -710,7 +710,7 @@ static int qpti_map_regs(struct qlogicpti *qpti)
 				 "PTI Qlogic/ISP");
 	if (!qpti->qregs) {
 		printk("PTI: Qlogic/ISP registers are unmappable\n");
-		return -1;
+		return -ENODEV;
 	}
 	if (qpti->is_pti) {
 		qpti->sreg = of_ioremap(&op->resource[0], (16 * 4096),
@@ -718,7 +718,7 @@ static int qpti_map_regs(struct qlogicpti *qpti)
 					"PTI Qlogic/ISP statreg");
 		if (!qpti->sreg) {
 			printk("PTI: Qlogic/ISP status register is unmappable\n");
-			return -1;
+			return -ENODEV;
 		}
 	}
 	return 0;