upnp: Use the default maximum content length of 16k.

Setting libupnp's maximum content length to zero makes it unable to
fetch any didl instead of the probably expected unlimited behavior.
(cherry picked from commit b00b016b55143c18e4b49ee300d656813b162f56)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/services_discovery/upnp.cpp

@@ -136,14 +136,6 @@ static int Open( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
-    i_res = UpnpSetMaxContentLength( 0 );
-    if( i_res != UPNP_E_SUCCESS )
-    {
-        msg_Err( p_sd, "Failed to set maximum content length: %s", UpnpGetErrorMessage( i_res ) );
-        Close( (vlc_object_t*) p_sd );
-        return VLC_EGENERIC;
-    }
-
     return VLC_SUCCESS;
 }