ALSA: Free global configuration tree after each snd_ctl_close and snd… #239

Job	Run time
Tarball	57s
MacOS	1m 0s
Linux (jack, JACK, jack=enabled, libjack-dev)	48s
MinGW (i686-w64-mingw32, dsound)	1m 1s
Linux (alsa, ALSA, alsa=enabled, libasound-dev)	47s
MinGW (x86_64-w64-mingw32, dsound)	50s
Linux (pulse, PULSE, pulse=enabled, libpulse-dev)	44s
MinGW (i686-w64-mingw32, asio, -Wno-unused-but-set-variable)	53s
Linux (oss, OSS, oss=true, oss4-dev)	1m 12s
MinGW (x86_64-w64-mingw32, asio, -Wno-unused-but-set-variable)	51s
MinGW (i686-w64-mingw32, wasapi)	1m 4s
MinGW (x86_64-w64-mingw32, wasapi)	57s
	11m 4s

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