add (nullable) annotation to three methods #877

	name: Aravis-Linux

	on:
	push:
	branches: [ main, aravis-0-8 ]
	pull_request:
	branches: [ main, aravis-0-8 ]
	release:
	workflow_dispatch:

	jobs:
	linux:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Install dependencies
	run: \|
	pip3 install meson ninja Markdown toml typogrify gi-docgen
	sudo apt update
	sudo apt install python3 libusb-1.0-0-dev gobject-introspection valgrind libgstreamer-plugins-bad1.0-dev libgtk-3-dev libgirepository1.0-dev python3-gi libunwind-dev gettext
	- name: Build
	run: \|
	meson setup --buildtype=plain -Ddocumentation=enabled -Dgst-plugin=enabled -Dintrospection=enabled -Dusb=disabled -Dviewer=enabled -Dgentl-producer=true . ./build
	ninja -C ./build
	meson configure -Dusb=enabled build
	ninja -C ./build
	env:
	CC: gcc
	- name: Tests
	run: meson test -C build/ -v
	- name: Valgrind
	run: meson test -C build/ -v --setup=valgrind
	- uses: actions/upload-artifact@v3
	if: failure()
	with:
	name: Linux_Meson_Testlog
	path: build/meson-logs/testlog*.txt
	- name: Development Documentation
	uses: peaceiris/actions-gh-pages@v3
	if: ${{ github.ref == 'refs/heads/main' }}
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./build/docs/reference/aravis/aravis-0.10
	destination_dir: aravis-main
	- name: Stable Documentation
	uses: peaceiris/actions-gh-pages@v3
	if: ${{ github.ref == 'refs/heads/aravis-0-8' }}
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./build/docs/reference/aravis/aravis-0.8
	destination_dir: aravis-stable

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