dlm: fix uninitialized spinlock

Use DEFINE_SPINLOCK for global dlm_cb_seq_spin.

Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/ast.c

@@ -15,8 +15,8 @@
 #include "lock.h"
 #include "user.h"
 
-static uint64_t			dlm_cb_seq;
-static spinlock_t		dlm_cb_seq_spin;
+static uint64_t dlm_cb_seq;
+static DEFINE_SPINLOCK(dlm_cb_seq_spin);
 
 static void dlm_dump_lkb_callbacks(struct dlm_lkb *lkb)
 {