173357 r=cavin sr=bienvenu fix a major bug in compacting local folders. We were compacting folder even after we failed to get a lock.

mailnews/base/src/nsMsgFolderCompactor.cpp

@@ -329,7 +329,7 @@ nsresult nsFolderCompactState::StartCompacting()
     m_folder->NotifyCompactCompleted();
     m_folder->ThrowAlertMsg("compactFolderDeniedLock", m_window);
     if (m_compactAll)
-      CompactNextFolder();
+      return CompactNextFolder();
     else
     {
       CleanupTempFilesAfterError();