sched: misc: Remove sched_lock in _assert()

Signed-off-by: hujun5 <hujun5@xiaomi.com>

sched/misc/assert.c

@@ -536,8 +536,6 @@ void _assert(FAR const char *filename, int linenum,
 
   flags = enter_critical_section();
 
-  sched_lock();
-
   /* try to save current context if regs is null */
 
   if (regs == NULL)
@@ -672,7 +670,5 @@ void _assert(FAR const char *filename, int linenum,
 #endif
     }
 
-  sched_unlock();
-
   leave_critical_section(flags);
 }