efi_loader: efi_dp_find_obj() add protocol check

Let function efi_dp_find_obj() additionally check if a given protocol is
installed on the handle relating to the device-path.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index d0f3e05..a7bc371 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1750,7 +1750,7 @@
 	info->system_table = &systab;
 
 	if (device_path) {
-		info->device_handle = efi_dp_find_obj(device_path, NULL);
+		info->device_handle = efi_dp_find_obj(device_path, NULL, NULL);
 
 		dp = efi_dp_append(device_path, file_path);
 		if (!dp) {