sh: Disable -Werror for arch/sh/oprofile/.

drivers/oprofile/ objects have proven to be problematic in this regard,
so simply disable -Werror for now.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/oprofile/Makefile

@@ -14,5 +14,3 @@ profdrvr-$(CONFIG_CPU_SUBTYPE_SH7750)	:= op_model_sh7750.o
 profdrvr-$(CONFIG_CPU_SUBTYPE_SH7091)	:= op_model_sh7750.o
 
 oprofile-y				:= $(DRIVER_OBJS) $(profdrvr-y)
-
-EXTRA_CFLAGS += -Werror