sys/cddl: remove extraneous semicolons

Fixes: 5a1b490d502e ("FreeBSD changes to vendor source.")
Fixes: 91eaf3e1831d ("Custom DTrace kernel module...")
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

(cherry picked from commit b1a217a369186dc45c7df7bde13a87868fd5b2c8)