savecore: add a test for LOG_PERROR
Signed-off-by: Stéphane Rochoy <stephane.rochoy@stormshield.eu>
Reviewed by: markj, oshogbo
MFC after: 2 weeks
Pull Request: https://github.com/freebsd/freebsd-src/pull/1546
(cherry picked from commit 3dc18af5770f9fc820343021d63dfc4cf09d9906)