minor symfony#28458 [OptionsResolver] remove dead code and useless else (ronfroy)

This PR was submitted for the master branch but it was squashed and merged into the 3.4 branch instead (closes symfony#28458).

Discussion
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[OptionsResolver] remove dead code and useless else

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

<!--
remove dead method and useless else
-->

Commits
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0c1484b [OptionsResolver] remove dead code and useless else

Author: nicolas-grekas

src/Symfony/Component/OptionsResolver/OptionsResolver.php

@@ -770,7 +770,9 @@ public function offsetGet($option)
 
                     // Don't include closures in the exception message
                     continue;
-                } elseif ($value === $allowedValue) {
+                }
+
+                if ($value === $allowedValue) {
                     $success = true;
                     break;
                 }
@@ -1060,20 +1062,4 @@ private static function isValueValidType($type, $value)
     {
         return (\function_exists($isFunction = 'is_'.$type) && $isFunction($value)) || $value instanceof $type;
     }
-
-    /**
-     * @return array
-     */
-    private function getInvalidValues(array $arrayValues, $type)
-    {
-        $invalidValues = array();
-
-        foreach ($arrayValues as $key => $value) {
-            if (!self::isValueValidType($type, $value)) {
-                $invalidValues[$key] = $value;
-            }
-        }
-
-        return $invalidValues;
-    }
 }