Blackfin: fix unused warnings after nommu update

The massive nommu update (8feae131) left the local variable "vml" unused,
so punt it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 63ccb28..aa76dfb 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -86,7 +86,6 @@
 static void decode_address(char *buf, unsigned long address)
 {
 #ifdef CONFIG_DEBUG_VERBOSE
-	struct vm_list_struct *vml;
 	struct task_struct *p;
 	struct mm_struct *mm;
 	unsigned long flags, offset;