efi: Rename END to EFI_DP_END

This exported symbol has a very generic name. Rename it to indicate that
it relates to EFI and device-paths.

Fix checkpatch warnings related to use of multiple assignments.

Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/lib/efi_loader/efi_device_path_utilities.c b/lib/efi_loader/efi_device_path_utilities.c
index f3ef3ea..87d52df 100644
--- a/lib/efi_loader/efi_device_path_utilities.c
+++ b/lib/efi_loader/efi_device_path_utilities.c
@@ -32,7 +32,7 @@
 	efi_uintn_t sz = 0;
 
 	EFI_ENTRY("%pD", device_path);
-	/* size includes the END node: */
+	/* size includes the EFI_DP_END node: */
 	if (device_path)
 		sz = efi_dp_size(device_path) + sizeof(struct efi_device_path);
 	return EFI_EXIT(sz);