fast_get: (cosmetic) reduce the number of gotos #1073

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 35s
LP64-WIP	4m 10s
build-linux (mnfst, mtl lnl)	5m 55s
manifest-check	55s
build-linux (mnfst, ptl)	5m 7s
build-linux (mnfst, tgl tgl-h)	5m 28s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	7m 3s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 12s
build-linux (zmain, mtl lnl)	5m 49s
build-windows (mtl lnl)	7m 45s
build-linux (zmain, ptl)	5m 3s
build-windows (ptl)	7m 46s
build-linux (zmain, tgl tgl-h)	5m 57s
build-windows (tgl tgl-h)	7m 59s
build-linux (-d, mnfst, lnl)	4m 41s
build-windows (-d, lnl)	6m 58s
build-linux (mnfst, --all)	13m 53s
compare-linux-win	1m 14s
	1h 51m 30s

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