Backport of "gstglwindow_x11.c: Fix colormap leak" into 1.22
requested to merge tpm/gstreamer:backport-mr-4047-into-1.22-tristan-fix-gstglwindow-colormap-leak into 1.22
Backport of !4047 (merged) "gstglwindow_x11.c: Fix colormap leak".
Commits:
- 0472c306 gstglwindow_x11.c: Fix colormap leak