audio: mixin_mixout: check sink_get_buffer() return value #23373

Job	Run time
manifest-check	2m 36s
build-windows (mnfst, tgl)	7m 59s
build-windows (mnfst, imx8m imx8ulp)	12m 22s
LP64-WIP	3m 57s
build-linux (mnfst, mtl)	4m 24s
build-windows (mnfst, imx8 imx8x)	10m 5s
build-linux (mnfst, ptl)	5m 49s
build-windows (-d, mnfst, lnl)	10m 24s
build-linux (-d, mnfst, lnl)	4m 26s
build-linux (mnfst, wcl imx95)	7m 11s
build-linux (mnfst, lnl)	4m 26s
build-windows (mnfst, mtl)	9m 25s
build-linux (mnfst, tgl-h)	4m 6s
build-windows (mnfst, lnl)	9m 11s
build-windows (mnfst, tgl-h)	9m 16s
build-linux (mnfst, imx8 imx8x)	5m 0s
build-windows (mnfst, ptl)	11m 30s
build-linux (mnfst, imx8m imx8ulp)	5m 2s
build-linux (mnfst, tgl)	4m 9s
compare-linux-win	33s
	2h 11m 51s

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