Blackfin arch: do not define decode_instruction if hwtrace is turned off

Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/traps.c

@@ -655,7 +655,7 @@ static bool get_instruction(unsigned short *val, unsigned short *address)
  * These are the normal instructions which cause change of flow, which
  * would be at the source of the trace buffer
  */
-#ifdef CONFIG_DEBUG_VERBOSE
+#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 static void decode_instruction(unsigned short *address)
 {
 	unsigned short opcode;