diff: bug fix in io.m

[Andrew Bromage]

G'day all.

This one is already committed.  No need for review.

Cheers,
Andrew Bromage


Estimated hours taken: 30 sec

library/io.m:
	Trivial bug fix.  io__remove_2 did not return a valid io__state.



Index: io.m
===================================================================
RCS file: /home/staff/zs/imp/mercury/library/io.m,v
retrieving revision 1.128
diff -u -r1.128 io.m
--- io.m	1997/07/18 08:11:25	1.128
+++ io.m	1997/07/23 06:03:20
@@ -2728,6 +2728,7 @@
 	} else {
 		RetStr = NULL;
 	}
+	update_io(IO0, IO);
 }").