kpb: Fix wrong array size #20685

Job	Run time
LP64-WIP	4m 9s
manifest-check	56s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 40s
build-windows (-d, lnl)	6m 23s
build-windows (mtl lnl)	7m 20s
build-windows (ptl)	5m 51s
build-windows (tgl tgl-h)	6m 47s
build-linux (mnfst, mtl lnl)	5m 57s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 41s
build-linux (zmain, ptl)	4m 35s
build-linux (mnfst, tgl tgl-h)	5m 29s
build-linux (-d, mnfst, lnl)	4m 45s
build-linux (mnfst, ptl)	5m 9s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 41s
build-linux (mnfst, --all)	16m 30s
build-linux (zmain, tgl tgl-h)	5m 39s
build-linux (zmain, mtl lnl)	5m 56s
compare-linux-win	29s
	1h 47m 57s

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