Cleanup return statements

Author: danmichaelo

src/Records.php

@@ -115,15 +115,15 @@ public function next()
         ++$this->position;
 
         if ($this->position > $this->numberOfRecords()) {
-            return null;
+            return;
         }
 
         if (count($this->data) == 0) {
             $this->fetchMore();
         }
 
         if (count($this->data) == 0) {
-            return null;
+            return;
         }
     }