fix: return on call to nextMuxer

When the call to multistream.Dialer.select is unsuccessful, call nextMuxer to try select the next one in the list but do not continue executing callback afterwards.

License: MIT
Signed-off-by: Alan Shaw <alan@tableflip.io>

src/dial.js

@@ -208,7 +208,7 @@ class Dialer {
             return callback(new Error('could not upgrade to stream muxing'))
           }
 
-          nextMuxer(muxers.shift())
+          return nextMuxer(muxers.shift())
         }
 
         const muxedConn = this.switch.muxers[key].dialer(conn)