xtensa_releasepending.c: Remove commented out code.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>

arch/xtensa/src/common/xtensa_releasepending.c

@@ -58,8 +58,6 @@ void up_release_pending(void)
 
   /* Merge the g_pendingtasks list into the ready-to-run task list */
 
-  /* sched_lock(); */
-
   if (nxsched_merge_pending())
     {
       /* The currently active task has changed!  We will need to