Reset mavlink channel before we use it

src/comm/LinkManager.cc

@@ -118,6 +118,7 @@ void LinkManager::_addLink(LinkInterface* link)
         // Find a mavlink channel to use for this link
         for (int i=0; i<32; i++) {
             if (!(_mavlinkChannelsUsedBitMask && 1 << i)) {
+                mavlink_reset_channel_status(i);
                 link->_setMavlinkChannel(i);
                 _mavlinkChannelsUsedBitMask |= i << i;
                 break;