i915: Fix more size_t format string warnings

The DRI people seem to have a hard time getting these right (see also
commit aeb565dfc3ac4c8b47c5049085b4c7bfb2c7d5d7).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1441831..8185766 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1457,7 +1457,7 @@
 
 	if ((obj_priv->gtt_offset & ~I915_FENCE_START_MASK) ||
 	    (obj_priv->gtt_offset & (obj->size - 1))) {
-		WARN(1, "%s: object 0x%08x not 1M or size (0x%x) aligned\n",
+		WARN(1, "%s: object 0x%08x not 1M or size (0x%zx) aligned\n",
 		     __func__, obj_priv->gtt_offset, obj->size);
 		return;
 	}