Merge pull request #2682 from tcanabrava/fixBitMask

bitwise and, not boolean and, to check for bitmasks.

src/comm/LinkManager.cc

@@ -174,7 +174,7 @@ 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)) {
+            if (!(_mavlinkChannelsUsedBitMask & 1 << i)) {
                 mavlink_reset_channel_status(i);
                 link->_setMavlinkChannel(i);
                 _mavlinkChannelsUsedBitMask |= i << i;