Linux 2.6.39 compat, DEFINE_SPINLOCK()

This is a long over due compatibility change.  Way, way, way back
in 2007 there was a push to remove all consumers of SPIN_LOCK_UNLOCKED.
Finally, in 2011 with 2.6.39 all the consumers have been updated
and SPIN_LOCK_UNLOCKED was removed.  It's about time we use the
new API as well, this change does exactly that.  DEFINE_SPINLOCK()
was available as far back as 2.6.12 so there doesn't need to be
any additional autoconf-foo for this change.

module/spl/spl-atomic.c

@@ -34,8 +34,8 @@
 
 #ifdef ATOMIC_SPINLOCK
 /* Global atomic lock declarations */
-spinlock_t atomic32_lock = SPIN_LOCK_UNLOCKED;
-spinlock_t atomic64_lock = SPIN_LOCK_UNLOCKED;
+DEFINE_SPINLOCK(atomic32_lock);
+DEFINE_SPINLOCK(atomic64_lock);
 
 EXPORT_SYMBOL(atomic32_lock);
 EXPORT_SYMBOL(atomic64_lock);

module/spl/spl-module.c

@@ -33,7 +33,7 @@
 
 #define SS_DEBUG_SUBSYS SS_MODULE
 
-static spinlock_t dev_info_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(dev_info_lock);
 static LIST_HEAD(dev_info_list);
 
 static struct dev_info *

module/spl/spl-vnode.c

@@ -39,7 +39,7 @@ EXPORT_SYMBOL(rootdir);
 static spl_kmem_cache_t *vn_cache;
 static spl_kmem_cache_t *vn_file_cache;
 
-static spinlock_t vn_file_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(vn_file_lock);
 static LIST_HEAD(vn_file_list);
 
 vtype_t