#25806 Reflection: Fix null as first return type

Author: ihor-sviziev

lib/internal/Magento/Framework/Reflection/TypeProcessor.php

@@ -288,7 +288,7 @@ public function getGetterReturnType($methodReflection)
         $types = $returnAnnotation->getTypes();
         $returnType = null;
         foreach ($types as $type) {
-            if ($type != 'null') {
+            if ($type !== 'null') {
                 $returnType = $type;
                 break;
             }