drm/i915/bios: prefer using dev_priv over dev pointer

dev_priv is the new black. Or something.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450271061-32646-3-git-send-email-jani.nikula@intel.com
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 9cb71b6..f75988f 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -370,7 +370,7 @@
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;
 
-	ret = intel_bios_init(dev);
+	ret = intel_bios_init(dev_priv);
 	if (ret)
 		DRM_INFO("failed to find VBIOS tables\n");