Lint

Use nullptr to represent fallback kernels #1

Job	Run time
lintrunner / linux-job	1s
android-java-format / linux-job	1s
link-check / lint-xrefs / linux-job	1s
link-check / lint-urls / linux-job	1d 0h 0m 1s
	1d 0h 0m 4s

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