Bug#58740 Valgrind warning in PFS (pfs_setup_actor.cc)

Valgrind gets confused by the call stack generated with optimized
builds, with inlined functions.
Reduced the stack context for the suppression in lf_pinbox_get_pins.

mysql-test/valgrind.supp

-# Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Library General Public
@@ -806,7 +806,6 @@
    fun:my_malloc
    fun:_lf_dynarray_lvalue
    fun:_lf_pinbox_get_pins
-   fun:lf_pinbox_get_pins
 }
 
 {