13b104bdef
Fixes an assertion failure in --enable-debug builds and SEGVs in normal builds. I'm not 100% sure I like this model, but it at least seems to be consistent. Some variation on this scheme will need to be adapted to the trunk, where usnic_del_procs() is called by the PML instead of internally in usnic_finalize(). A related bug (but with different mechanics) is #4832. This commit was SVN r32424.