efi_loader: use %pUs for printing GUIDs

For printing GUIDs with macro EFI_ENTRY use %pUs instead of %pUl to provide
readable debug output.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/lib/efi_loader/efi_rng.c b/lib/efi_loader/efi_rng.c
index 0e06546..bb11d8d 100644
--- a/lib/efi_loader/efi_rng.c
+++ b/lib/efi_loader/efi_rng.c
@@ -122,7 +122,7 @@
 	}
 
 	if (rng_algorithm) {
-		EFI_PRINT("RNG algorithm %pUl\n", rng_algorithm);
+		EFI_PRINT("RNG algorithm %pUs\n", rng_algorithm);
 		if (guidcmp(rng_algorithm, &rng_raw_guid)) {
 			status = EFI_UNSUPPORTED;
 			goto back;