Generic/UselessOverridingMethod: remove redundant call to count()

This commit simply replaces a call to `count($token)` with
`$phpcsFile->numTokens`.

Author: rodrigoprimo

src/Standards/Generic/Sniffs/CodeAnalysis/UselessOverridingMethodSniff.php

@@ -115,8 +115,7 @@ public function process(File $phpcsFile, $stackPtr)
 
         $parameters       = [''];
         $parenthesisCount = 1;
-        $count            = count($tokens);
-        for (++$next; $next < $count; ++$next) {
+        for (++$next; $next < $phpcsFile->numTokens; ++$next) {
             $code = $tokens[$next]['code'];
 
             if ($code === T_OPEN_PARENTHESIS) {