mshtml: Use stored nsdoc in IHTMLDocument2::put_title.

dlls/mshtml/htmldoc.c

@@ -369,28 +369,18 @@ static HRESULT WINAPI HTMLDocument_get_anchors(IHTMLDocument2 *iface, IHTMLEleme
 static HRESULT WINAPI HTMLDocument_put_title(IHTMLDocument2 *iface, BSTR v)
 {
     HTMLDocument *This = HTMLDOC_THIS(iface);
-    nsIDOMHTMLDocument *nshtmldoc;
-    nsIDOMDocument *nsdoc;
     nsAString nsstr;
     nsresult nsres;
 
     TRACE("(%p)->(%s)\n", This, debugstr_w(v));
 
-    if(!This->nscontainer)
-        return E_FAIL;
-
-    nsres = nsIWebNavigation_GetDocument(This->nscontainer->navigation, &nsdoc);
-    if(NS_FAILED(nsres) || !nsdoc) {
-        ERR("GetDocument failed: %08x\n", nsres);
-        return E_FAIL;
+    if(!This->nsdoc) {
+        WARN("NULL nsdoc\n");
+        return E_UNEXPECTED;
     }
 
-    nsIDOMDocument_QueryInterface(nsdoc, &IID_nsIDOMHTMLDocument, (void**)&nshtmldoc);
-    nsIDOMDocument_Release(nsdoc);
-
     nsAString_Init(&nsstr, v);
-    nsres = nsIDOMHTMLDocument_SetTitle(nshtmldoc, &nsstr);
-    nsIDOMHTMLDocument_Release(nshtmldoc);
+    nsres = nsIDOMHTMLDocument_SetTitle(This->nsdoc, &nsstr);
     nsAString_Finish(&nsstr);
     if(NS_FAILED(nsres))
         ERR("SetTitle failed: %08x\n", nsres);