efi_loader: avoid writing message in Exit() boot service

We should not write messages in UEFI API functions. This may lead to
incorrect screen layout in UEFI application.

For single statements after if clause we don't need braces.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
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 080e7f7..38b0af9 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -3495,10 +3495,9 @@
 	if (IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)) {
 		if (image_obj->image_type == IMAGE_SUBSYSTEM_EFI_APPLICATION) {
 			ret = efi_tcg2_measure_efi_app_exit();
-			if (ret != EFI_SUCCESS) {
-				log_warning("tcg2 measurement fails(0x%lx)\n",
-					    ret);
-			}
+			if (ret != EFI_SUCCESS)
+				log_debug("tcg2 measurement fails (0x%lx)\n",
+					  ret);
 		}
 	}