[PATCH -next] drm/qxl: Fix randbuild error

[YueHaibing]

If DEM_QXL is y and DRM_TTM_HELPER is m, building fails:

drivers/gpu/drm/qxl/qxl_object.o: undefined reference to `drm_gem_ttm_print_info'

Select DRM_TTM_HELPER to fix this.

Fixes: 78d54f1f6a33 ("drm/qxl: use drm_gem_ttm_print_info")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/gpu/drm/qxl/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/qxl/Kconfig b/drivers/gpu/drm/qxl/Kconfig
index d0d691b..ca3f51c 100644
--- a/drivers/gpu/drm/qxl/Kconfig
+++ b/drivers/gpu/drm/qxl/Kconfig
@@ -4,6 +4,7 @@ config DRM_QXL
 	depends on DRM && PCI && MMU
 	select DRM_KMS_HELPER
 	select DRM_TTM
+	select DRM_TTM_HELPER
 	select CRC32
 	help
 	  QXL virtual GPU for Spice virtualization desktop integration.
-- 
2.7.4