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_helper.c b/lib/efi_loader/efi_helper.c
index 2acae78..44b806a 100644
--- a/lib/efi_loader/efi_helper.c
+++ b/lib/efi_loader/efi_helper.c
@@ -200,7 +200,7 @@
 		efi_free_pool(tmp_dp);
 		if (!*dp)
 			return EFI_OUT_OF_RESOURCES;
-		*dp_size += efi_dp_size(initrd_dp) + sizeof(END);
+		*dp_size += efi_dp_size(initrd_dp) + sizeof(EFI_DP_END);
 	}
 
 	if (fdt_dp) {
@@ -210,10 +210,10 @@
 		efi_free_pool(tmp_dp);
 		if (!*dp)
 			return EFI_OUT_OF_RESOURCES;
-		*dp_size += efi_dp_size(fdt_dp) + sizeof(END);
+		*dp_size += efi_dp_size(fdt_dp) + sizeof(EFI_DP_END);
 	}
 
-	*dp_size += sizeof(END);
+	*dp_size += sizeof(EFI_DP_END);
 
 	return EFI_SUCCESS;
 }