Fix leak introduced in 0e6c3ff9

oss-fuzz/29305
7 jobs for leak in 4 minutes and 34 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #6487958
build

00:04:28

passed #6487963
build_android

00:00:51

passed #6487959
build_clang_libcpp

00:04:33

passed #6487962
build_clazy

00:02:28

passed #6487961
build_mingw64_fedora

00:02:56

passed #6487960
build_ubuntu_16_04

00:02:31

passed #6487957
clang_format

00:01:20