Fix logic of fb_shutdown checkHEADmaster

From https://www.firebirdsql.org/file/documentation/release_notes/html/en/2_5/rnfb25-apiods-api.html
"
Return Values
    A return value of zero means shutdown was successful
    A non-zero value means some errors occurred during the shutdown. Details will be written to firebird.log.
"

Change-Id: I1139e1abdd1f07f0fad23f24a177aa5439546b19
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/184939
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

0 files changed, 0 insertions, 0 deletions