clean up some warnings when building recovery

Change-Id: I1541534ee6978ddf8d548433986679ce9507d508
diff --git a/updater/Android.mk b/updater/Android.mk
index 2e92504..c21ff8e 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -20,6 +20,7 @@
 
 ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
 LOCAL_CFLAGS += -DUSE_EXT4
+LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_C_INCLUDES += system/extras/ext4_utils
 LOCAL_STATIC_LIBRARIES += \
     libext4_utils_static \