add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/jffs2/background.c
..
..
@@ -125,7 +125,7 @@
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 			if (try_to_freeze())
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 				goto again;
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-			signr = kernel_dequeue_signal(NULL);
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+			signr = kernel_dequeue_signal();
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 			switch(signr) {
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 			case SIGSTOP: