ipc4: helper: guard TLV loop against NULL from tlv_next() #23129

Job	Run time
build-linux (mnfst, wcl imx95)	7m 36s
build-linux (mnfst, ptl)	5m 42s
build-linux (mnfst, tgl-h)	4m 27s
manifest-check	4m 18s
build-windows (mnfst, mtl)	9m 20s
build-windows (mnfst, imx8 imx8x)	9m 37s
build-linux (mnfst, lnl)	4m 41s
build-windows (mnfst, ptl)	10m 13s
build-windows (mnfst, lnl)	9m 8s
build-linux (mnfst, tgl)	4m 54s
build-linux (-d, mnfst, lnl)	4m 41s
build-windows (-d, mnfst, lnl)	8m 56s
build-linux (mnfst, imx8m imx8ulp)	4m 50s
build-windows (mnfst, tgl-h)	9m 11s
build-windows (mnfst, tgl)	9m 24s
LP64-WIP	4m 14s
build-windows (mnfst, imx8m imx8ulp)	10m 17s
build-linux (mnfst, imx8 imx8x)	5m 32s
build-linux (mnfst, mtl)	6m 12s
compare-linux-win	24s
	2h 13m 37s

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