2c24ad3377
If "ifconfig create" tries to load a kernel module, and the module exists but can't be loaded, fail the command with a useful error message. This is helpful, for example, when trying to create a cloned interface in a vnet jail. But ignore ENOENT, because sometimes ifconfig can't correctly guess the name of the required kernel module. MFC after: 2 weeks Reviewed by: jhb Differential Revision: https://reviews.freebsd.org/D37873