mavlink-core: src: Fix embedded v2 read header #524

Job	Run time
mavlink-dump	50s
internal-tests (ardupilotmega)	1m 4s
linting	1m 37s
formatting	5s
internal-tests (asluav)	1m 28s
msrv	4m 19s
internal-tests (matrixpilot)	1m 30s
internal-tests (minimal)	1m 2s
internal-tests (paparazzi)	1m 16s
internal-tests (python_array_test)	1m 17s
internal-tests (slugs)	1m 10s
internal-tests (standard)	1m 3s
internal-tests (test)	1m 6s
internal-tests (ualberta)	1m 19s
internal-tests (uavionix)	1m 4s
internal-tests (icarous)	1m 2s
internal-tests (common)	1m 9s
docs	1m 2s
build (macos-latest, x86_64-apple-darwin, --features ardupilotmega)	1m 42s
build (ubuntu-latest, arm-unknown-linux-musleabihf, --features ardupilotmega)	2m 5s
build (ubuntu-latest, armv7-unknown-linux-musleabihf, --features ardupilotmega)	1m 58s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega)	2m 4s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega,emit-description,emit-e...	1m 59s
build (ubuntu-latest, thumbv7m-none-eabi, --no-default-features --features embedded)	1m 14s
build (windows-latest, x86_64-pc-windows-msvc, --features ardupilotmega)	3m 3s
test-embedded-size	39s
	38m 7s

Provide feedback