audio: dai: add NULL converter guard in IPC4 playback fanout #23124

Job	Run time
LP64-WIP	3m 50s
manifest-check	2m 48s
build-linux (mnfst, imx8m imx8ulp)	5m 5s
build-linux (mnfst, imx8 imx8x)	5m 35s
build-linux (mnfst, ptl)	5m 59s
build-linux (mnfst, tgl)	4m 45s
build-linux (mnfst, mtl)	4m 43s
build-linux (mnfst, lnl)	4m 18s
build-windows (mnfst, tgl)	9m 25s
build-windows (mnfst, mtl)	11m 14s
build-linux (-d, mnfst, lnl)	4m 29s
build-windows (mnfst, tgl-h)	8m 29s
build-windows (mnfst, imx8m imx8ulp)	11m 9s
build-linux (mnfst, wcl imx95)	7m 0s
build-windows (mnfst, lnl)	10m 13s
build-windows (mnfst, ptl)	10m 44s
build-windows (-d, mnfst, lnl)	9m 39s
build-linux (mnfst, tgl-h)	4m 21s
build-windows (mnfst, imx8 imx8x)	10m 3s
compare-linux-win	38s
	2h 14m 27s

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