Bug 1682240 - Kill ntlm_auth process instead of waiting for it to complete r=necko-reviewers,kershaw

This avoids hangs when the process might be unresponsive.

Differential Revision: https://phabricator.services.mozilla.com/D116715

extensions/auth/nsAuthSambaNTLM.cpp

@@ -37,8 +37,7 @@ void nsAuthSambaNTLM::Shutdown() {
     mToChildFD = nullptr;
   }
   if (mChildPID) {
-    int32_t exitCode;
-    PR_WaitProcess(mChildPID, &exitCode);
+    PR_KillProcess(mChildPID);
     mChildPID = nullptr;
   }
 }