minor #4570 Command::execute() should always return an integer (derra…

…bus)

This PR was merged into the 2.15 branch.

Discussion
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Command::execute() should always return an integer

In Symfony 4.4, a deprecation error is triggered if `Command::execute()` does not return an integer, see symfony/symfony#33747. This PR adds the necessary `return` statements.

Commits
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ee758b1 Command::execute() should always return an integer.

src/Console/Command/DescribeCommand.php

@@ -106,7 +106,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             if ('@' === $name[0]) {
                 $this->describeSet($output, $name);
 
-                return null;
+                return 0;
             }
 
             $this->describeRule($output, $name);
@@ -126,6 +126,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 null === $alternative ? '' : ' Did you mean "'.$alternative.'"?'
             ));
         }
+
+        return 0;
     }
 
     /**

src/Console/Command/ReadmeCommand.php

@@ -287,5 +287,7 @@ static function (array $matches) {
         $footer = str_replace('%download.url%', $downloadUrl, $footer);
 
         $output->write($header."\n".$help."\n".$footer);
+
+        return 0;
     }
 }

src/Console/Command/SelfUpdateCommand.php

@@ -171,5 +171,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         rename($tempFilename, $localFilename);
 
         $output->writeln(sprintf('<info>php-cs-fixer updated</info> (<comment>%s</comment>)', $remoteTag));
+
+        return 0;
     }
 }