liblog: set -Werror

- Deal with some -Wunused issues
- Cleanup UNUSED to __unused transition

Change-Id: Icd33808d4c974625f4fd0a126a90a2b4c90c8314
diff --git a/liblog/Android.mk b/liblog/Android.mk
index 41440ad..69ca416 100644
--- a/liblog/Android.mk
+++ b/liblog/Android.mk
@@ -57,7 +57,7 @@
 # ========================================================
 LOCAL_MODULE := liblog
 LOCAL_SRC_FILES := $(liblog_host_sources)
-LOCAL_CFLAGS := -DFAKE_LOG_DEVICE=1
+LOCAL_CFLAGS := -DFAKE_LOG_DEVICE=1 -Werror
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -74,7 +74,7 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE := lib64log
 LOCAL_SRC_FILES := $(liblog_host_sources)
-LOCAL_CFLAGS := -DFAKE_LOG_DEVICE=1 -m64
+LOCAL_CFLAGS := -DFAKE_LOG_DEVICE=1 -m64 -Werror
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 # Shared and static library for target
@@ -82,13 +82,13 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE := liblog
 LOCAL_SRC_FILES := $(liblog_target_sources)
-LOCAL_CFLAGS := $(liblog_cflags)
+LOCAL_CFLAGS := -Werror
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
 LOCAL_MODULE := liblog
 LOCAL_WHOLE_STATIC_LIBRARIES := liblog
-LOCAL_CFLAGS := $(liblog_cflags)
+LOCAL_CFLAGS := -Werror
 include $(BUILD_SHARED_LIBRARY)
 
 include $(call first-makefiles-under,$(LOCAL_PATH))