patch to fix potential problem with wiphy_update_regulatory

[Sven Neumann]

While investigating the crashes I found that wiphy_update_regulatory
is from one place being called without the lock held that protects
the static variable it uses. I am sending you a patch that corrects
this issue. Unfortunately this change does not fix the crashes that
I reported. I am sending you the patch for review nevertheless.


Regards,
Sven