tearDown the filesystem right before setting it up again

apps/files_trashbin/command/expire.php

@@ -49,6 +49,7 @@ class Expire implements ICommand {
 	}
 
 	public function handle() {
+		\OC_Util::tearDownFS();
 		\OC_Util::setupFS($this->user);
 		Trashbin::expire($this->trashBinSize, $this->user);
 	}