[m-rev.] diff: Fix a threadscope profiling bug.

[Paul Bone]

Fix a bug in the Mercury runtime's threadscope support that could cause a
buffer overrun.

runtime/mercury_threadscope.c:
    As above.

Index: runtime/mercury_threadscope.c
===================================================================
RCS file: /home/mercury1/repository/mercury/runtime/mercury_threadscope.c,v
retrieving revision 1.6
diff -u -p -b -r1.6 mercury_threadscope.c
--- runtime/mercury_threadscope.c	20 Mar 2010 10:15:51 -0000	1.6
+++ runtime/mercury_threadscope.c	24 May 2010 02:49:38 -0000
@@ -381,7 +381,7 @@ enough_room_for_variable_size_event(
     return (buffer->MR_tsbuffer_pos + length + 
                 event_type_sizes[MR_TS_EVENT_BLOCK_MARKER] +
                 ((2 + 8) * 2) + 2) /* (EventType, Time) * 2 + StringLength */
-        - MR_TS_BUFFERSIZE;
+            < MR_TS_BUFFERSIZE;
 }
 
 /*
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