Blackfin arch: convert L2 defines to be the same as the L1 defines

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

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index ad922ab..62a47d6 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -567,7 +567,7 @@
 	 * we don't read something in the async space that can hang forever
 	 */
 	if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
-#ifdef L2_START
+#if L2_LENGTH != 0
 	    (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 #endif
 	    (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||