dmi_scan: add comments on dmi_present() and the loop in dmi_scan_machine()
dmi_scan: add comments on dmi_present() and the loop in dmi_scan_machine()

My previous refactoring in commit 79bae42d51a5 ("dmi_scan: refactor
dmi_scan_machine(), {smbios,dmi}_present()") resulted in slightly tricky
code (though I think it's more elegant).  Explain what it's doing.

Signed-off-by: Ben Hutchings <73675debcd8a436be48ec22211dcf44fe0df0a64@decadent.org.uk>
Cc: Zhenzhong Duan <0a6aad489bf65c23415e55e6bee033aa588b7328@oracle.com>
Cc: Jean Delvare <efca98801f3398ebd7eeff805a2c18e6c49e84d4@suse.de>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs