CLEANUP: listener: function comment typo in stop_listener()

A minor typo related to stop_listener() function comment
was introduced in 0013288.

This makes stop_listener() function comment easier to read.
diff --git a/src/listener.c b/src/listener.c
index bddc29f..b4b4d3d 100644
--- a/src/listener.c
+++ b/src/listener.c
@@ -331,13 +331,13 @@
 }
 
 /*
- * This function completely stops a listener. It will need to operate under the
+ * This function completely stops a listener.
+ * The proxy's listeners count is updated and the proxy is
+ * disabled and woken up after the last one is gone.
  * It will need to operate under the proxy's lock and the protocol's lock.
  * The caller is responsible for indicating in lpx, lpr whether the
  * respective locks are already held (non-zero) or not (zero) so that the
  * function picks the missing ones, in this order.
- * The proxy's listeners count is updated and the proxy is
- * disabled and woken up after the last one is gone.
  */
 void stop_listener(struct listener *l, int lpx, int lpr)
 {