gtfsrt buffer reuse: fix compilation #271

Job	Run time
ui	37s
openapi-validate	17s
formatting	49s
linux (linux-amd64-release, linux-amd64)	1m 7s
msvc (Debug)	4m 27s
linux (clang-tidy)	3m 1s
macos (macos-x86_64, On)	9m 19s
msvc (Release)	4m 23s
linux (linux-sanitizer)	1m 57s
macos (macos-arm64)	10m 25s
linux (linux-debug, valgrind --suppressions=deps/osr/docs/tbb.supp --suppressions=deps/osr/docs/p...	4m 34s
docker	27s
	41m 23s

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