drm/i915: Make IS_GEN macros only take dev_priv

Saves 1416 bytes of .rodata strings.

v2: Add parantheses around dev_priv. (Ville Syrjala)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476352990-2504-1-git-send-email-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index 89d1d23..c21bc00 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -72,7 +72,7 @@
 	if (tiling_mode > I915_TILING_LAST)
 		return false;
 
-	if (IS_GEN2(dev) ||
+	if (IS_GEN2(dev_priv) ||
 	    (tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev_priv)))
 		tile_width = 128;
 	else
@@ -91,7 +91,7 @@
 		if (stride > 8192)
 			return false;
 
-		if (IS_GEN3(dev)) {
+		if (IS_GEN3(dev_priv)) {
 			if (size > I830_FENCE_MAX_SIZE_VAL << 20)
 				return false;
 		} else {