We need to set the current vnet before iterating over the global
interface list. Because the dump device may only be set from the host,
only proceed with configuration if the thread belongs to the default
vnet. [1]
Also fix a resource leak that occurs if the priv_check() in set_dumper()
fails.
Reported by: mmacy, sbruno [1]
Reviewed by: sbruno
X-MFC with: r333283
Differential Revision: https://reviews.freebsd.org/D15449
b35822d9d0