Warning fixes found under hardest mode of OpenWatcom. Seems clean in Borland, MinGW and DMC.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29660 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/ftp.cpp

@@ -728,7 +728,7 @@ wxSocketBase *wxFTP::GetPassivePort()
                         (wxUint16)a[3] << 16 |
                         (wxUint16)a[4] << 8 |
                         a[5];
-    wxUint16 port = (wxUint16)a[0] << 8 | a[1];
+    wxUint16 port = (wxUint16)(a[0] << 8 | a[1]);
 
     wxIPV4address addr;
     addr.Hostname(hostaddr);