rimage: fix resource leak #19562

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 30s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 0s
build-linux (mnfst, mtl)	4m 43s
build-windows (mtl)	5m 40s
build-linux (mnfst, lnl)	4m 26s
build-windows (tgl tgl-h)	6m 31s
build-linux (mnfst, ptl)	4m 33s
build-windows (-d, mtl)	6m 9s
build-linux (mnfst, tgl tgl-h)	5m 38s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 23s
LP64-WIP	4m 1s
build-linux (zmain, mtl)	3m 46s
manifest-check	48s
build-linux (zmain, lnl)	5m 17s
build-linux (zmain, ptl)	4m 28s
build-linux (zmain, tgl tgl-h)	5m 31s
build-linux (-d, mnfst, mtl)	4m 46s
build-linux (mnfst, --all)	13m 47s
compare-linux-win	22s
	1h 41m 19s

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