i965: Don't print a fatal-looking message if intelCreateContext fails.

i965: Don't print a fatal-looking message if intelCreateContext fails.

With the old context creation mechanism, an application asked the GL to
give it a context.  Failing to produce a context was a fatal error.

Now, with GLX_ARB_create_context, the application can request a specific
version.  If it's higher than the maximum version we support, context
creation will fail.  But this is a normal error that applications
recover from.

In particular, the new glxinfo tries to create OpenGL 4.3, 4.2, 4.1,
4.0, 3.3, and 3.2 contexts before finally succeeding at creating a 3.1
context.  This led to it printing the following message 6 times:
"brwCreateContext: failed to init intel context"

There's no need to alarm users (and developers) with such a message.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>