Fix type of length out parameter #844

Job	Run time
build on fedora:37	2m 0s
build on ubuntu:23.10	1m 27s
build on fedora:38	1m 48s
Build dist with Linux	49s
build on ubuntu:23.04	1m 30s
build on centos:7	1m 34s
build on ubuntu:22.04	1m 27s
build on ubuntu:20.04	2m 12s
build on ubuntu:18.04	1m 13s
build on ubuntu:16.04	1m 19s
build on ubuntu:14.04	2m 4s
build on debian:12	1m 29s
build on debian:11	1m 48s
build on debian:10	1m 41s
Build Windows release (windows-latest, x86)	10m 47s
Build MacOS release (macos-latest, amd)	1m 14s
Build Windows release (windows-latest, x64)	9m 20s
Build MacOS release (macos-latest-xlarge, arm)	57s
	44m 39s

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