The kernel linkers would call linker_file_unload() to unload partially
linked file. At this moment event handlers kld_load have not been
invoked yet so it makes no senses to invoke kld_unload_try and kld_unload
event handlers.
PR: 274375
Fixes: 8f7254629ff1 Invoke the kld_* event handlers from linker_load_file() ...
MFC after: 2 weeks