MIPS: FW: Build with -Werror

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/fw/arc/Makefile

@@ -8,3 +8,5 @@ lib-y				+= cmdline.o env.o file.o identify.o init.o \
 lib-$(CONFIG_ARC_MEMORY)	+= memory.o
 lib-$(CONFIG_ARC_CONSOLE)	+= arc_con.o
 lib-$(CONFIG_ARC_PROMLIB)	+= promlib.o
+
+EXTRA_CFLAGS			+= -Werror