Oops in i915 intel_init_clock_gating

[Scott Ashcroft]

Looks like the following commit:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6067aaeadb5b3df26f27ac827256b1ef01e674f5


didn't cope with the pineview case so dev_priv->display.init_clock_gating is 
NULL causing an Oops.

The old code didn't seem to do anything for pineview so I wrapped the call with 
a simple NULL check but I'm not sure if that's the correct fix.

Cheers,
Scott

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