[PATCH] Fix leak of virStreamPtr object with callback added in fdstream impl

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

When adding a callback to an FD stream, we take an extra reference
on the virStreamPtr instance. We forgot to registered a free function
with the callback, so when the callback was removed, the extra
reference held on virStreamPtr was not released.

* src/fdstream.c: Use a free callback to release reference on
  virStreamPtr when removing callback
---
 src/fdstream.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/src/fdstream.c b/src/fdstream.c
index 182b6fa..54f8198 100644
--- a/src/fdstream.c
+++ b/src/fdstream.c
@@ -171,6 +171,13 @@ static void virFDStreamEvent(int watch ATTRIBUTE_UNUSED,
     }
 }
 
+static void virFDStreamCallbackFree(void *opaque)
+{
+    virStreamPtr st = opaque;
+    virStreamFree(st);
+}
+
+
 static int
 virFDStreamAddCallback(virStreamPtr st,
                        int events,
@@ -198,7 +205,7 @@ virFDStreamAddCallback(virStreamPtr st,
                                            events,
                                            virFDStreamEvent,
                                            st,
-                                           NULL)) < 0) {
+                                           virFDStreamCallbackFree)) < 0) {
         streamsReportError(VIR_ERR_INTERNAL_ERROR,
                            "%s", _("cannot register file watch on stream"));
         goto cleanup;
-- 
1.7.4.4

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