The lock acquisition in g_raid3_ctl_insert() was improperly dropped a
while ago, making it impossible to add or replace a device in an
existing graid3. This went unnoticed because the tests are broken.
MFC after: 1 week
Fixes: fcf69f3dbce6 ("Consistently use gctl_get_provider instead of home-grown variants.")
Event: EuroBSDcon DevSummit 2026