cfg80211: replace reg.c Nokia commit c4c32294

Nokia hasn't gotten back to me in over 1 month for a relicense
change request. There are only a few changes that they contributed,
so just reverting their changes but replacing with another set.
This change replaces this commit:

commit c4c32294
Author: Yuri Ershov <ext-yuri.ershov@nokia.com>
Date:   Tue Jun 29 15:08:08 2010 +0400

    cfg80211: Update of regulatory request initiator handling

    In some cases there could be possible dereferencing freed pointer. The
    update is intended to avoid this issue.

Signed-off-by: Yuri Ershov <ext-yuri.ershov@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

Cc: Petri Karhula <petri.karhula@nokia.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>