Also always return in app commands

Signed-off-by: Joas Schilling <coding@schilljs.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/apps/files_external/lib/Command/Backends.php b/apps/files_external/lib/Command/Backends.php
index e06f5ea5fd1..3bb4b9121ae 100644
--- a/apps/files_external/lib/Command/Backends.php
+++ b/apps/files_external/lib/Command/Backends.php
@@ -59,7 +59,7 @@ class Backends extends Base {
 		parent::configure();
 	}
 
-	protected function execute(InputInterface $input, OutputInterface $output) {
+	protected function execute(InputInterface $input, OutputInterface $output): int {
 		$authBackends = $this->backendService->getAuthMechanisms();
 		$storageBackends = $this->backendService->getBackends();
 
@@ -87,6 +87,7 @@ class Backends extends Base {
 		}
 
 		$this->writeArrayInOutputFormat($input, $output, $data);
+		return 0;
 	}
 
 	private function serializeAuthBackend(\JsonSerializable $backend) {