[telepathy-mission-control/master] Fix ambiguous comment

[Simon McVittie]

I intended "arbitrary non-NULL" to mean "only the fact that it is not
NULL is API", but sjoerd briefly thought I meant "user-defined non-NULL".
---
 src/mcd-dispatch-operation.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mcd-dispatch-operation.c b/src/mcd-dispatch-operation.c
index 6320c12..f48236c 100644
--- a/src/mcd-dispatch-operation.c
+++ b/src/mcd-dispatch-operation.c
@@ -85,7 +85,7 @@ struct _McdDispatchOperationPrivate
     guint needs_approval : 1;
 
     /* set of handlers we already tried
-     * dup'd bus name (string) => arbitrary non-NULL pointer */
+     * dup'd bus name (string) => dummy non-NULL pointer */
     GHashTable *failed_handlers;
 
     /* Results */
-- 
1.5.6.5