audio: kpb: Fix overruns in kpb module #20705

Job	Run time
manifest-check	52s
LP64-WIP	2m 58s
build-windows (ptl)	6m 20s
build-windows (mtl lnl)	7m 21s
build-windows (-d, lnl)	6m 6s
build-windows (tgl tgl-h)	6m 54s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 6s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	3m 28s
build-linux (zmain, mtl lnl)	3m 14s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 19s
build-linux (zmain, tgl tgl-h)	3m 5s
build-linux (mnfst, mtl lnl)	3m 20s
build-linux (mnfst, ptl)	3m 40s
build-linux (mnfst, tgl tgl-h)	3m 4s
build-linux (mnfst, --all)	3m 18s
build-linux (-d, mnfst, lnl)	3m 5s
build-linux (zmain, ptl)	3m 18s
compare-linux-win	26s
	1h 12m 54s

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