[efi] Fix incorrect debug message level when device has no device path

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/interface/efi/efi_driver.c

 					  &devpath.interface,
 					  efi_image_handle, device,
 					  EFI_OPEN_PROTOCOL_BY_DRIVER ) ) != 0){
-		DBGCP ( device, "EFIDRV %p %s has no device path\n",
-			device, efi_handle_devpath_text ( device ) );
+		DBGC ( device, "EFIDRV %p %s has no device path\n",
+		       device, efi_handle_devpath_text ( device ) );
 		goto err_no_device_path;
 	}
 	efidev->path = devpath.devpath;