audio: kpb: fix potential NULL pointer dereference in device list reset #287

Job	Run time
LP64-WIP	3m 48s
manifest-check	48s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	5m 49s
build-linux (mnfst, mtl)	4m 18s
build-linux (mnfst, lnl)	4m 16s
build-linux (mnfst, tgl tgl-h)	5m 15s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 11s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 49s
build-windows (mtl)	6m 35s
build-linux (zmain, mtl)	4m 26s
build-windows (tgl tgl-h)	7m 1s
build-linux (zmain, lnl)	4m 13s
build-windows (-d, mtl)	6m 45s
build-linux (zmain, tgl tgl-h)	5m 18s
build-linux (-d, mnfst, mtl)	4m 31s
build-linux (mnfst, --all)	12m 16s
compare-linux-win	22s
	1h 29m 41s

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