SideChain: fixed use-after-free in precalc code #1636

Job	Run time
build-alpine-static (x86_64, -flto=2 -fuse-linker-plugin -ffunction-sections -Wno-error=inline)	4m 3s
build-alpine-static (aarch64, -flto=2 -fuse-linker-plugin -ffunction-sections -Wno-error=inline)	41m 13s
build-macos	8m 16s
build-freebsd (freebsd, x86-64, 12.4, ubuntu-22.04)	47m 40s
build-macos-aarch64	3m 33s
build-openbsd (openbsd, x86-64, 7.2, ubuntu-22.04)	37m 50s
build-ubuntu (ubuntu-20.04, gcc-11, g++-11)	3m 34s
build-ubuntu (ubuntu-22.04, gcc-12, g++-12)	3m 54s
build-ubuntu-aarch64 (ubuntu-20.04, -flto=2 -fuse-linker-plugin -ffunction-sections)	10m 7s
build-ubuntu-aarch64 (ubuntu-22.04, -flto=2 -fuse-linker-plugin -ffunction-sections)	9m 34s
build-ubuntu-static-libs (-flto=2 -fuse-linker-plugin -ffunction-sections -Wno-error=inline)	5m 41s
build-windows-msbuild (Visual Studio 16 2019, 2019, C:\Program Files (x86)\Microsoft Visual Studi...	9m 6s
build-windows-msbuild (Visual Studio 16 2019, 2019, C:\Program Files (x86)\Microsoft Visual Studi...	7m 32s
build-windows-msbuild (Visual Studio 16 2019, 2019, C:\Program Files (x86)\Microsoft Visual Studi...	10m 52s
build-windows-msys2 (gcc, g++, -flto=2 -fuse-linker-plugin -ffunction-sections -Wno-error=maybe-u...	14m 40s
build-windows-msys2 (clang, clang++, -flto -ffunction-sections -fuse-ld=lld -Wno-unused-command-l...	11m 53s
	3h 49m 28s

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