Use "else if" to remove one level of indentation.

core/command/upgrade.php

@@ -72,8 +72,7 @@ class Upgrade extends Command {
 
 			$updater->upgrade();
 			return self::ERROR_SUCCESS;
-		} else {
-			if(\OC_Config::getValue('maintenance', false)) {
+		} else if(\OC_Config::getValue('maintenance', false)) {
 			//Possible scenario: ownCloud core is updated but an app failed
 			$output->writeln('ownCloud is in maintenance mode');
 			$output->write('Maybe an upgrade is already in process. Please check the '
@@ -87,5 +86,4 @@ class Upgrade extends Command {
 			return self::ERROR_UP_TO_DATE;
 		}
 	}
-	}
 }