Fix memory leak reported by clang tool #216

Job	Run time
build (fedora:latest, true)	47s
build (quay.io/centos/centos:stream8, true)	1m 18s
build (quay.io/centos/centos:stream9, true)	1m 17s
build (debian:testing, true)	3m 8s
build (debian:latest, true)	3m 6s
build (ubuntu:latest, true)	3m 32s
build (ubuntu:rolling, true)	3m 3s
build (ubuntu:lunar, true)	2m 36s
build (ubuntu:jammy, true)	1m 48s
build (ubuntu:focal, true)	3m 54s
build (quay.io/fedora/fedora:rawhide, false)	41s
build (ubuntu:devel, false)	3m 1s
	28m 11s

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