kernel panic with _autoload_ nvidia driver

[Stas Timokhin]

     Hello !

> d>    This problems appears about 4-6 months ago after updating of  
> -CURRENT host.
> d> Unable to boot host with nvidia_load="YES" in loader.conf because panic.
> d> But when nvidia driver loads manually via kldload, everything OK.
> d> Nvidia driver version is 310.44 at this moment, but problem was and on
> d> earlier version too.
> d> Here is output of debugging (full version at
> d> http://www.stasyan.com/devel/kern_crash_nvidia_autoload.txt)
> Can you please try the attached patch to kernel?
Test of patch with nvidia-driver-310.44_1 (builded by clang from  
-CURRENT) passed successfully - booting module from /boot/loader.conf  
is OK.

Thank you !