st/wgl: check for NULL piAttribList in wglCreatePbufferARB()

Java2d opengl pipeline passes NULL piAttribList to
wglCreatePbufferARB(). So skip parsing the attribute list
if it is NULL.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Neha Bhende <bhenden@vmware.com>
1 file changed