Merge pull request zendframework/zendframework#2904 branch 'hotfix/pu…

…t-assignment-inline'

src/Input.php

@@ -101,8 +101,7 @@ public function setBreakOnFailure($breakOnFailure)
      */
     public function setErrorMessage($errorMessage)
     {
-        $errorMessage = (null === $errorMessage) ? null : (string) $errorMessage;
-        $this->errorMessage = $errorMessage;
+        $this->errorMessage = (null === $errorMessage) ? null : (string) $errorMessage;
         return $this;
     }