bug 296522: nsJAR.cpp uses wrong allocator

patch by john <johnli1995@hotmail.com>, r=darin, a=asa

modules/libjar/nsJAR.cpp

@@ -160,7 +160,7 @@ PR_STATIC_CALLBACK(PRBool)
 DeleteManifestEntry(nsHashKey* aKey, void* aData, void* closure)
 {
 //-- deletes an entry in  mManifestData.
-  PR_FREEIF(aData);
+  delete (nsJARManifestItem*)aData;
   return PR_TRUE;
 }