Fix integer underflow in `try_range_response` for empty files #5869

Job	Run time
check-docs	21s
check	39s
cargo-hack	2m 34s
cargo-deny check (advisories)	29s
dependencies-are-sorted	7s
cargo-deny check (bans licenses sources)	27s
cargo-public-api-crates (axum)	56s
cargo-public-api-crates (axum-macros)	37s
cargo-public-api-crates (axum-extra)	50s
cargo-public-api-crates (axum-core)	37s
Spell Check with Typos	8s
test-nightly	0s
wasm32-unknown-unknown	0s
test-docs	0s
armv5te-unknown-linux-musleabi	0s
test-versions	0s
test-msrv	0s
	7m 45s

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