Adding check for null. r=dveditz/sr=nullcheck

xpcom/proxy/src/nsProxyEvent.cpp

@@ -32,7 +32,6 @@
  * 04/20/2000       IBM Corp.      Added PR_CALLBACK for Optlink use in OS2
  */
 
-
 #include "nsProxyEvent.h"
 #include "nsProxyEventPrivate.h"
 #include "nsIProxyObjectManager.h"
@@ -283,7 +282,7 @@ nsProxyObject::Release(void)
       // need to do something special here so that
       // the real object will always be deleted on
       // the correct thread..
-      
+
         PLEvent *event = PR_NEW(PLEvent);
         if (event == nsnull)
         {

xpcom/proxy/src/nsProxyObjectManager.cpp

@@ -155,6 +155,9 @@ nsProxyObjectManager::GetProxyForObject(nsIEventQueue *destQueue,
                                         PRInt32 proxyType, 
                                         void** aProxyObject)
 {
+    if (!aObj) return NS_ERROR_NULL_POINTER;
+    if (!aProxyObject) return NS_ERROR_NULL_POINTER;
+
     nsresult rv;
     nsCOMPtr<nsIEventQueue> postQ;
     
@@ -202,7 +205,7 @@ nsProxyObjectManager::GetProxy(  nsIEventQueue *destQueue,
                                  PRInt32 proxyType, 
                                  void** aProxyObject)
 {
-
+    if (!aProxyObject) return NS_ERROR_NULL_POINTER;
     *aProxyObject = nsnull;
     
     // 1. Create a proxy for creating an instance on another thread.