dlm: don't print common non-errors

Change log_error() to log_debug() for conditions that can occur in
large number in normal operation.
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lock.c

@@ -4258,7 +4258,7 @@ int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
 	put_rsb(r);
  out:
 	if (error)
-		log_print("recover_master_copy %d %x", error, rl->rl_lkid);
+		log_debug(ls, "recover_master_copy %d %x", error, rl->rl_lkid);
 	rl->rl_result = error;
 	return error;
 }