inout: fix `InOutBufReserved::get_out_len` (#1147) #752

Job	Run time
build (1.60.0, armv7a-none-eabi)	2m 4s
build (1.60.0, thumbv7em-none-eabi)	2m 3s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 29s
build (1.60.0, wasm32-unknown-unknown)	2m 32s
cross (aarch64-unknown-linux-gnu, stable)	44s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	2m 15s
build (stable, armv7a-none-eabi)	16s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 28s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	29s
build (stable, thumbv7em-none-eabi)	17s
cross (powerpc-unknown-linux-gnu, stable)	42s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	2m 3s
build (stable, wasm32-unknown-unknown)	15s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	10s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	2m 13s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	23s
test (x86_64-apple-darwin, macos-latest, stable)	24s
x86 (x86_64-unknown-linux-gnu, stable)	19s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 42s
test (x86_64-pc-windows-msvc, windows-latest, stable)	46s
minimal-versions / minimal-versions	55s
	26m 29s

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