nvc0/vbo: Fix crash with enabled vertex attrib without buffer
Fixes the spec@!opengl 3.1@vao-broken-attrib piglit
Signed-off-by: Yusuf Khan yusisamerican@gmail.com
Fixes the spec@!opengl 3.1@vao-broken-attrib piglit
Signed-off-by: Yusuf Khan yusisamerican@gmail.com