glx: fix attrib list end token
glx: fix attrib list end token

It seems this list should be terminated by 0 rather than GLX_NONE.

http://www.opengl.org/registry/specs/ARB/glx_create_context.txt
"<attrib_list> specifies a list of attributes for the context.
 The list consists of a sequence of <name,value> pairs
 terminated by the value None (0)."

Signed-off-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

waffle-gl/waffle,evelikov/waffle,yinquan529/waffle-gl-waffle,chadversary/waffle,yinquan529/waffle-gl-waffle,maurossi/waffle,waffle-gl/waffle,chadversary/waffle,janesma/waffle,dcbaker/waffle,maurossi/waffle,waffle-gl/waffle,fjhenigman/waffle,waffle-gl/waffle,maurossi/waffle,fjhenigman/waffle,evelikov/waffle,janesma/waffle,yinquan529/waffle-gl-waffle,chadversary/waffle,evelikov/waffle,dcbaker/waffle,fjhenigman/waffle,dcbaker/waffle,janesma/waffle