Safe TSL_FD from closing by guest

Author: kotee4ko

linux-user/syscall.c

@@ -8382,7 +8382,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
 #endif
     case TARGET_NR_close:
         if (unlikely(arg1 == TSL_FD))
-	    return 0x00;
+            return 0x00;
         fd_trans_unregister(arg1);
         return get_errno(close(arg1));