Fix trivial leak in ThreadFilter #626

Job	Run time
check-for-pr	1s
check-formatting	53s
test-matrix / test-linux-glibc-j9 (8, debug)	2m 36s
test-matrix / test-linux-glibc-oracle8 (debug)	3m 0s
test-matrix / test-linux-glibc (8u412+9, debug)	2m 48s
test-matrix / test-linux-glibc-zing (8, debug)	2m 43s
test-matrix / test-linux-glibc (11.0.23+12, debug)	5m 59s
test-matrix / test-linux-glibc-j9 (11, debug)	2m 35s
test-matrix / test-linux-glibc-zing (11, debug)	4m 28s
test-matrix / test-linux-glibc (17.0.11+12, debug)	5m 43s
test-matrix / test-linux-glibc-j9 (17, debug)	2m 32s
test-matrix / test-linux-musl (8u412+9, debug)	4m 12s
test-matrix / test-linux-glibc (21.0.3+12, debug)	6m 4s
test-matrix / test-linux-glibc-zing (17, debug)	4m 20s
test-matrix / test-linux-musl (11.0.23+12, debug)	7m 36s
test-matrix / test-ubuntu-jdk (11.0.23-librca, debug)	5m 49s
test-matrix / test-linux-glibc (22.0.1+12, debug)	6m 3s
test-matrix / test-linux-glibc-zing (21, debug)	4m 37s
test-matrix / test-linux-musl (17.0.11+12, debug)	7m 18s
test-matrix / test-ubuntu-jdk (17.0.11-librca, debug)	5m 54s
test-matrix / test-linux-musl (21.0.3+12, debug)	7m 13s
test-matrix / test-ubuntu-jdk (21.0.3-librca, debug)	6m 26s
test-matrix / test-linux-musl (22.0.1+12, debug)	7m 18s
test-matrix / test-ubuntu-jdk (22.0.1-librca, debug)	6m 15s
gh-release	0s
	1h 52m 23s

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