#363 Forgetting to free the allocated memory of `snd_device_name_get_hint()` can cause memory leak

[Arya Lee]

According to the ALSA library document, we should free the return value of snd_device_name_get_hint() after use. Otherwise, it will cause the memory leak.

The return value should be freed when no longer needed.

In file plugins/audio_alsa.c, name in L547 and desc in L549 should be freed. We can simply use free().

[Sean Young]

Fixed in commit aaf355e02b13c717e077f4b4efad2f86e5880276