Fixed a nsIRDFResource leak.

rdf/base/src/nsCompositeDataSource.cpp

@@ -512,10 +512,10 @@ DBGetSTCursor::Advance(void)
         if (NS_FAILED(result)) return result;
 
         while (NS_RDF_CURSOR_EMPTY != result) {
-            nsIRDFResource* src;
-            nsIRDFNode*     trg;            
-            mCurrentCursor->GetSource(&src);
-            mCurrentCursor->GetTarget(&trg);
+            nsCOMPtr<nsIRDFResource> src;
+            nsCOMPtr<nsIRDFNode>     trg;            
+            mCurrentCursor->GetSource(getter_AddRefs(src));
+            mCurrentCursor->GetTarget(getter_AddRefs(trg));
             if (!mCompositeDataSourceImpl->HasAssertionN(mCount-1, src, mLabel, trg, !mTruthValue)) {
                 return NS_OK;
             } else {