drm/i915: fix sparse warnings: make symbols static

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 0dee776..b8723b7 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -821,8 +821,8 @@
  * some RAM for the framebuffer at early boot.  This code figures out
  * how much was set aside so we can use it for our own purposes.
  */
-int i915_probe_agp(struct drm_device *dev, unsigned long *aperture_size,
-		   unsigned long *preallocated_size)
+static int i915_probe_agp(struct drm_device *dev, unsigned long *aperture_size,
+			  unsigned long *preallocated_size)
 {
 	struct pci_dev *bridge_dev;
 	u16 tmp = 0;
@@ -1007,7 +1007,7 @@
 }
 
 
-int i915_driver_firstopen(struct drm_device *dev)
+static int i915_driver_firstopen(struct drm_device *dev)
 {
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		return 0;