staging: lustre: ldlm: Fix extern variable declaration

Move the extern declaration to a header file common to all users of the
variable. This fixes the following sparse warning:
symbol 'ldlm_cancel_unused_locks_before_replay' was not declared.
Should it be static?
Signed-off-by: Imre Deak <imre.deak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ldlm/ldlm_internal.h

@@ -103,6 +103,7 @@ int ldlm_cancel_lru_local(struct ldlm_namespace *ns,
 			  struct list_head *cancels, int count, int max,
 			  enum ldlm_cancel_flags cancel_flags, int flags);
 extern unsigned int ldlm_enqueue_min;
+extern unsigned int ldlm_cancel_unused_locks_before_replay;
 
 /* ldlm_resource.c */
 int ldlm_resource_putref_locked(struct ldlm_resource *res);

drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c

@@ -877,8 +877,6 @@ void ldlm_put_ref(void)
 }
 EXPORT_SYMBOL(ldlm_put_ref);
 
-extern unsigned int ldlm_cancel_unused_locks_before_replay;
-
 static ssize_t cancel_unused_locks_before_replay_show(struct kobject *kobj,
 						      struct attribute *attr,
 						      char *buf)