camera: replace `-Wno-error` flag with `-Werror`

Test: add `USE_CAMERA_V4L2_HAL := true` to
      hardware/libhardware/modules/camera/3_4/Android.mk and build
      mmm hardware/libhardware/modules/camera/3_4
Change-Id: Ib7227f189cdcd52698ef1a70b1ad03b2351cb55f
Signed-off-by: Sergii Piatakov <sergii.piatakov@globallogic.com>
diff --git a/modules/camera/3_4/Android.mk b/modules/camera/3_4/Android.mk
index 6ecedac..3395b5b 100644
--- a/modules/camera/3_4/Android.mk
+++ b/modules/camera/3_4/Android.mk
@@ -36,7 +36,7 @@
   libyuv_static \
   libjpeg_static_ndk \
 
-v4l2_cflags := -fno-short-enums -Wall -Wno-error -Wextra -fvisibility=hidden -DHAVE_JPEG
+v4l2_cflags := -fno-short-enums -Wall -Wextra -Werror -fvisibility=hidden -DHAVE_JPEG
 
 v4l2_c_includes := $(call include-path-for, camera) \
   external/libyuv/files/include \