[PATCH] Fix bugs in cmd_ide.c and cmd_scsi.c

Fix bug introduced by "Fix get_partition_info() parameter error in all
other calls" from 2005-03-04 in cmd_ide.c and cmd_scsi.c, which prevented
to use diskboot or scsiboot form another device than 0.

Signed-off-by: Denis Peter <d.peter@mpl.ch>