efi_loader: LoadImage must return EFI_NOT_FOUND

If the file path does not relate to an existing file, LoadImage() must
return EFI_NOT_FOUND.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 7bb0fc2..251dfc4 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1779,7 +1779,7 @@
 	/* Open file */
 	f = efi_file_from_path(file_path);
 	if (!f)
-		return EFI_DEVICE_ERROR;
+		return EFI_NOT_FOUND;
 
 	/* Get file size */
 	bs = 0;