GfxRadialShading::parse: Fix memory leak on broken files

6 jobs for fix_leak_N in 3 minutes and 9 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #465305
build

00:03:09

passed #465310
build_android

00:02:07

passed #465306
build_clang_libcpp

00:03:06

passed #465309
build_clazy

00:03:00

passed #465308
build_mingw64_fedora

00:02:50

passed #465307
build_ubuntu_16_04

00:01:37