[easy] remove no-op from ArcanistLinter#raiseLintAtPath

Summary:
Remove extra call to getActivePath

Test Plan:
Inspection

Differential Revision: 205579
Reviewed By: epriestley
Reviewers: epriestley
CC: epriestley
Revert Plan:
OK

src/lint/linter/base/ArcanistLinter.php

@@ -143,7 +143,6 @@ abstract class ArcanistLinter {
     $code,
     $desc) {
 
-    $path = $this->getActivePath();
     return $this->raiseLintAtLine(null, null, $code, $desc, null, null);
   }