As implemented in colord 1.4.6, cd_icc_load_handle() has three possible
results:
1. success, taking ownership of the profile;
2. failure because cmsGetProfileContextID returns NULL, *not* taking
ownership of the profile;
3. failure in cd_icc_load(), taking ownership of the profile.
The previous commit ensures that we are not in case 2.
In case 3 where cd_icc_load() fails, ownership was already given to
the colord CdIcc object, so it will be freed when the g_autoptr unrefs
the CdIcc, and we must not free it again: that would be a double-free,
potentially resulting in memory corruption.
Resolves: https://gitlab.gnome.org/GNOME/mutter/-/issues/2659
Signed-off-by: Simon McVittie <smcv@debian.org>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2877>
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