network: utils: Fix int conversion errors #8805

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 20s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 26s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	11m 35s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	11m 36s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	11m 51s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	12m 32s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	11m 51s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	11m 53s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	12m 40s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	11m 51s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	43m 18s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	11m 39s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 41s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	11m 41s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 33s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	10m 48s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	13m 50s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	14m 9s
Unit tests (matrix)	1s
	4h 10m 15s

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