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kernel: restore original context for noted(NDFLT)

When debugging, we want to see the original context,
not the one of the note handler calling noted(NDFLT0).

--- a/sys/src/9/port/sysproc.c

+++ b/sys/src/9/port/sysproc.c

@@ -928,6 +928,7 @@

 		up->lastnote->flag = NDebug;

 		/* fall through */

 	case NDFLT:

+		noted(up->dbgreg, nureg, arg);	/* for debugging */

 		if(up->lastnote->flag == NDebug)

 			pprint("suicide: %s\n", up->lastnote->msg);

 		pexit(up->lastnote->msg, up->lastnote->flag!=NDebug);

-- 

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