sh: kgdb: Fix up NULL pointer deref by kgdb_nmicallback.

kgdb_nmicallback expects valid register state, so just fetch the register
state with get_irq_regs() as on other platforms.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
index ba8e763..38b3139 100644
--- a/arch/sh/kernel/kgdb.c
+++ b/arch/sh/kernel/kgdb.c
@@ -313,7 +313,7 @@
 
 static void kgdb_call_nmi_hook(void *ignored)
 {
-	kgdb_nmicallback(raw_smp_processor_id(), NULL);
+	kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
 }
 
 void kgdb_roundup_cpus(unsigned long flags)