[PATCH] drivers/gpu/drm/tilcdc: Makefile, only -Werror when no -W* in EXTRA_CFLAGS

[Chen Gang]

  When make with EXTRA_CFLAGS=-W, it will report error.
  so give a check in Makefile.

Signed-off-by: Chen Gang <gang.chen at asianux.com>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat at qca.qualcomm.com>
---
 drivers/gpu/drm/tilcdc/Makefile |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/Makefile b/drivers/gpu/drm/tilcdc/Makefile
index deda656..562733a 100644
--- a/drivers/gpu/drm/tilcdc/Makefile
+++ b/drivers/gpu/drm/tilcdc/Makefile
@@ -1,4 +1,7 @@
-ccflags-y := -Iinclude/drm -Werror
+ccflags-y := -Iinclude/drm
+ifeq (, $(findstring -W,$(EXTRA_CFLAGS)))
+	ccflags-y += -Werror
+endif
 
 tilcdc-y := \
 	tilcdc_crtc.o \
-- 
1.7.7.6