drm/radeon: squash lines for simple wrapper functions

Remove unneeded variables and assignments.

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1473863952-7658-3-git-send-email-yamada.masahiro@socionext.com
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 6406536..a951881 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2631,11 +2631,7 @@
 u32 r600_gfx_get_wptr(struct radeon_device *rdev,
 		      struct radeon_ring *ring)
 {
-	u32 wptr;
-
-	wptr = RREG32(R600_CP_RB_WPTR);
-
-	return wptr;
+	return RREG32(R600_CP_RB_WPTR);
 }
 
 void r600_gfx_set_wptr(struct radeon_device *rdev,