misc: fix more strutils related exit codes

misc: fix more strutils related exit codes

Found by grep:

grep -l "\bEXIT_\|exit *( *[0-9][0-9] *)\|strutils\.h" $(grep -L \
    strutils_set_exitcode  $(git grep -l "_EX_\|FINDFS_\|BLKID_EXIT\|EX_USAGE" -- "*.c"))

The Command shows also some false positives (fstrim.c,
context_mount.c, ...)

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>