mshtml: Handle S_FALSE return values from IUri methods.

dlls/mshtml/main.c

@@ -215,7 +215,7 @@ compat_mode_t get_max_compat_mode(IUri *uri)
 {
     compat_config_t *iter;
     size_t len, iter_len;
-    BSTR host;
+    BSTR host = NULL;
     HRESULT hres;
 
     static INIT_ONCE init_once = INIT_ONCE_STATIC_INIT;
@@ -224,8 +224,10 @@ compat_mode_t get_max_compat_mode(IUri *uri)
     if(!uri)
         return global_max_compat_mode;
     hres = IUri_GetHost(uri, &host);
-    if(FAILED(hres))
+    if(hres != S_OK) {
+        SysFreeString(host);
         return global_max_compat_mode;
+    }
     len = SysStringLen(host);
 
     LIST_FOR_EACH_ENTRY(iter, &compat_config, compat_config_t, entry) {

dlls/mshtml/persist.c

@@ -1176,7 +1176,8 @@ static HRESULT WINAPI HlinkTarget_Navigate(IHlinkTarget *iface, DWORD grfHLNF, L
         if (FAILED(hres))
             return hres;
 
-        ShellExecuteW(NULL, L"open", uri, NULL, NULL, SW_SHOW);
+        if(hres == S_OK)
+            ShellExecuteW(NULL, L"open", uri, NULL, NULL, SW_SHOW);
         SysFreeString(uri);
         return S_OK;
     }

dlls/mshtml/script.c

@@ -1123,7 +1123,7 @@ HRESULT load_script(HTMLScriptElement *script_elem, const WCHAR *src, BOOL async
 
     hres = IUri_GetScheme(uri, &bsc->scheme);
     IUri_Release(uri);
-    if(FAILED(hres))
+    if(hres != S_OK)
         bsc->scheme = URL_SCHEME_UNKNOWN;
 
     IHTMLScriptElement_AddRef(&script_elem->IHTMLScriptElement_iface);