Update port names when they are renamed

[fpesari]

Hello,

a2jmidid does not seem to update port names when they are renamed.

I tried it with Rosegarden, I created a MIDI port and then renamed it. The ALSA MIDI port is renamed correctly, the JACK MIDI port created by a2jmidid kept the old name (unnamed, in this case).

[dvzrv]

That sounds like a bug.

Pull request welcome!

[hselasky]

I think this is a bug in the Linux kernel, that no port change events are emitted!

[hselasky]

Made this fix for FreeBSD:
hselasky/alsa-seq-server@8dc8bae

This fix needs to be adapted to the Linux kernel I guess, and it will work just fine!