healthd: Turn on -Werror

Change-Id: I72caf38008ee7d842dfacd3f58add9bc8e4787e8
diff --git a/healthd/Android.mk b/healthd/Android.mk
index 715c2ed..1d238b1 100644
--- a/healthd/Android.mk
+++ b/healthd/Android.mk
@@ -7,6 +7,7 @@
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES := healthd_board_default.cpp
 LOCAL_MODULE := libhealthd.default
+LOCAL_CFLAGS := -Werror
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
@@ -24,7 +25,7 @@
 LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)
 LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)
 
-LOCAL_CFLAGS := -D__STDC_LIMIT_MACROS
+LOCAL_CFLAGS := -D__STDC_LIMIT_MACROS -Werror
 
 ifeq ($(strip $(BOARD_CHARGER_DISABLE_INIT_BLANK)),true)
 LOCAL_CFLAGS += -DCHARGER_DISABLE_INIT_BLANK