Use the new exit code when scanning code from STDIN

For now, always return a zero-exit code when the fixer runs on code provided via STDIN. This should be re-evaluated at a later time to see if we can get this to use the `ExitCode::calculate()` method as well.

Author: jrfnl

src/Reports/Cbf.php

@@ -15,6 +15,7 @@
 
 use PHP_CodeSniffer\Exceptions\DeepExitException;
 use PHP_CodeSniffer\Files\File;
+use PHP_CodeSniffer\Util\ExitCode;
 use PHP_CodeSniffer\Util\Timing;
 use PHP_CodeSniffer\Util\Writers\StatusWriter;
 
@@ -60,7 +61,7 @@ public function generateFileReport($report, File $phpcsFile, $showSources=false,
             // even if nothing was fixed. Exit here because we
             // can't process any more than 1 file in this setup.
             $fixedContent = $phpcsFile->fixer->getContents();
-            throw new DeepExitException($fixedContent, 1);
+            throw new DeepExitException($fixedContent, ExitCode::OKAY);
         }
 
         if ($errors === 0) {