Fix `inflate_fast_help` loop bound #1068

Job	Run time
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	42s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	58s
cargo-c dynamic library	11s
Clippy	20s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	35s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 2s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 3s
Clippy (--no-default-features --features="c-allocator")	19s
Clippy (--no-default-features --features="rust-allocator")	19s
Build and test (stable, macos-latest, x86_64-apple-darwin)	59s
Smoke-test fuzzing targets (default)	2m 36s
Build and test (stable, macos-14, aarch64-apple-darwin)	53s
Smoke-test fuzzing targets (c-allocator)	2m 42s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	2m 51s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	2m 16s
Smoke-test fuzzing targets (rust-allocator)	2m 36s
vanilla dynamic library	17s
Miri	1m 53s
run flate2 test suite	21s
wasm32	39s
	23m 32s

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