kernel: add release function #7973

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	20m 28s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	18m 53s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	21m 10s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	18m 26s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	19m 14s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	20m 6s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	19m 54s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	19m 9s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	19m 3s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	19m 40s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	49m 53s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	20m 34s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	18m 36s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	23m 40s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	20m 25s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	12m 39s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	13m 36s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	12m 32s
Unit tests (matrix)	1s
	6h 7m 59s

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