[intel] Check for ioremap() failures

Debugged-by: Anton D. Kachalov <mouse@yandex-team.ru>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/intel.c

 
 	/* Map registers */
 	intel->regs = ioremap ( pci->membase, INTEL_BAR_SIZE );
+	if ( ! intel->regs ) {
+		rc = -ENODEV;
+		goto err_ioremap;
+	}
 
 	/* Reset the NIC */
 	if ( ( rc = intel_reset ( intel ) ) != 0 )
 	intel_reset ( intel );
  err_reset:
 	iounmap ( intel->regs );
+ err_ioremap:
 	netdev_nullify ( netdev );
 	netdev_put ( netdev );
  err_alloc:

src/drivers/net/intelx.c

 
 	/* Map registers */
 	intel->regs = ioremap ( pci->membase, INTEL_BAR_SIZE );
+	if ( ! intel->regs ) {
+		rc = -ENODEV;
+		goto err_ioremap;
+	}
 
 	/* Reset the NIC */
 	if ( ( rc = intelx_reset ( intel ) ) != 0 )
 	intelx_reset ( intel );
  err_reset:
 	iounmap ( intel->regs );
+ err_ioremap:
 	netdev_nullify ( netdev );
 	netdev_put ( netdev );
  err_alloc: