defxx: Fix the handling of ioremap() failures

If ioremap_nocache() is unfortunate enough to fail, the error code is not
set correctly leading to a false success from dfx_register().  This change
fixes the problem.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/defxx.c

@@ -566,6 +566,7 @@ static int __devinit dfx_register(struct device *bdev)
 		bp->base.mem = ioremap_nocache(bar_start, bar_len);
 		if (!bp->base.mem) {
 			printk(KERN_ERR "%s: Cannot map MMIO\n", print_name);
+			err = -ENOMEM;
 			goto err_out_region;
 		}
 	} else {