Build on amd64, run test application from PR208570.
^ this belongs into the 'Submitted by'
^ This does not really help to understand what the patch does :)
Stephen's first message in the PR is probably a bit more descriptive:
When using ALSA with FreeBSD, the direct snd_device instances are not available, only plugin devices and "default". For programs which use QAudio, this means there are *no* devices enumerated using QAudio::availableDevices(). The attached patch adds the aliases to the available device list.