assert: Stop scheduling when an assert is invoked to prevent running task change

Signed-off-by: zhangyuan21 <zhangyuan21@xiaomi.com>

sched/misc/assert.c

@@ -559,6 +559,8 @@ 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)
@@ -680,5 +682,7 @@ void _assert(FAR const char *filename, int linenum,
 #endif
     }
 
+  sched_unlock();
+
   leave_critical_section(flags);
 }