Calling `glLoadName()` was possible with '-1' value (65535 actually), in `draw_pose_bones()`...
Note I think bug exists since ages (at least, seems to be already present in 2008
when drawarmature.c was added in repo)!
Odd behavior reported (issue only affected objects once parented to the armature) was
due to ordering stuff, since only objects drawn *after* the armature were affected.
6a43ee6e38