net: lan966x: fix a IS_ERR() vs NULL check in lan966x_create_targets()

The devm_ioremap() function does not return error pointers. It returns
NULL.

Fixes: db8bcaad5393 ("net: lan966x: add the basic lan966x driver")
Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Horatiu Vultur <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/microchip/lan966x/lan966x_main.c

···
 		begin[idx] = devm_ioremap(&pdev->dev,
 					  iores[idx]->start,
 					  resource_size(iores[idx]));
-		if (IS_ERR(begin[idx])) {
+		if (!begin[idx]) {
 			dev_err(&pdev->dev, "Unable to get registers: %s\n",
 				iores[idx]->name);
-			return PTR_ERR(begin[idx]);
+			return -ENOMEM;
 		}
 	}