Clean up style and make more consistent.
Replace test with if-then-else to make the script more legible.
Replace the call to dirname with the shell %/* operator avoiding a
fork & exec.
Reorder the test for $var_run_autosave before the test for /var/run on
tmpfs. This avoids gratuitously scanning the mount table for a tmpfs
/var/run.
Initial concept by and in discussion with:
Harry Schmalzbauer <freebsd@omnilan.de>
No functional change intended.
MFC after: 2 weeks