MINOR: lb/api: remove the locked argument from take_conn/drop_conn

This essentially reverts commit 2b4370078 ("MINOR: lb/api: let callers
of take_conn/drop_conn tell if they have the lock") that was merged
during 2.4 before the various locks could be eliminated at the lower
layers. Passing that information complicates the cleanup of the queuing
code and it's become useless.
diff --git a/src/lb_fas.c b/src/lb_fas.c
index fb581eb..53bd039 100644
--- a/src/lb_fas.c
+++ b/src/lb_fas.c
@@ -60,11 +60,9 @@
 /* Re-position the server in the FS tree after it has been assigned one
  * connection or after it has released one. Note that it is possible that
  * the server has been moved out of the tree due to failed health-checks.
- *
- * <locked> must reflect the server's lock ownership. The lbprm's lock will
- * be used.
+ * The lbprm's lock will be used.
  */
-static void fas_srv_reposition(struct server *s, int locked)
+static void fas_srv_reposition(struct server *s)
 {
 	HA_RWLOCK_WRLOCK(LBPRM_LOCK, &s->proxy->lbprm.lock);
 	if (s->lb_tree) {