Reduce lock lifetime in TCollection::GarbageCollect
Reduce lock lifetime in TCollection::GarbageCollect

This avoid the potential for unnecessary nested locks
when/if the routine actually deletes the object.

kirbyherm/root-r-tools,kirbyherm/root-r-tools,kirbyherm/root-r-tools,Dr15Jones/root,kirbyherm/root-r-tools,tc3t/qoot,tc3t/qoot,Dr15Jones/root,Dr15Jones/root,tc3t/qoot,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools,kirbyherm/root-r-tools,tc3t/qoot,Dr15Jones/root,Dr15Jones/root,tc3t/qoot,Dr15Jones/root,tc3t/qoot,tc3t/qoot,kirbyherm/root-r-tools,tc3t/qoot,Dr15Jones/root