K 10
svn:author
V 7
dufault
K 8
svn:date
V 27
1995-03-06T15:02:13.000000Z
K 7
svn:log
V 232
Submitted by:	bde@zeta.org.au (Bruce Evans)

Fix it so that calls to extend_get won't dereference 0 when "swap
on sd.." calls sdsize() on systems with no SCSI devices.

This probably really fixes Poul's "boot with no SCSI" problem.

END