math: fft: move NULL guard before plan dereferences in HiFi3 variants #23138

Job	Run time
manifest-check	3m 19s
LP64-WIP	3m 49s
build-windows (mnfst, lnl)	8m 53s
build-windows (mnfst, mtl)	9m 12s
build-windows (mnfst, tgl-h)	9m 19s
build-windows (mnfst, ptl)	10m 49s
build-windows (mnfst, imx8 imx8x)	9m 33s
build-windows (-d, mnfst, lnl)	9m 24s
build-windows (mnfst, tgl)	8m 53s
build-linux (mnfst, ptl)	6m 10s
build-linux (mnfst, lnl)	4m 54s
build-linux (mnfst, mtl)	4m 37s
build-linux (mnfst, imx8 imx8x)	4m 53s
build-windows (mnfst, imx8m imx8ulp)	11m 12s
build-linux (mnfst, imx8m imx8ulp)	4m 49s
build-linux (mnfst, tgl)	4m 44s
build-linux (-d, mnfst, lnl)	5m 23s
build-linux (mnfst, tgl-h)	4m 16s
build-linux (mnfst, wcl imx95)	7m 37s
compare-linux-win	30s
	2h 12m 16s

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