idc: clear task pointer after free on prepare error #23667

Job	Run time
manifest-check	3m 5s
LP64-WIP	3m 36s
build-windows (mnfst, lnl)	10m 58s
build-windows (mnfst, tgl)	8m 15s
build-windows (mnfst, imx8 imx8x)	12m 59s
build-linux (mnfst, lnl)	4m 49s
build-linux (mnfst, tgl-h)	4m 20s
build-linux (mnfst, mtl)	4m 26s
build-linux (-d, mnfst, lnl)	4m 5s
build-linux (mnfst, imx8m imx8ulp)	4m 28s
build-windows (mnfst, imx8m imx8ulp)	8m 59s
build-linux (mnfst, ptl)	5m 0s
build-windows (mnfst, mtl)	9m 23s
build-windows (mnfst, ptl)	7m 27s
build-linux (mnfst, wcl imx95)	6m 22s
build-windows (-d, mnfst, lnl)	8m 17s
build-linux (mnfst, imx8 imx8x)	4m 42s
build-linux (mnfst, tgl)	3m 58s
build-windows (mnfst, tgl-h)	8m 35s
compare-linux-win	58s
	2h 4m 42s

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