fix dbus message leaks

I reviewed all places that call
dbus_connection_send_with_reply_and_block(), and found several places
where dbus messages aren't properly unreffed.

src/modules/bluetooth/backend-ofono.c

@@ -168,9 +168,15 @@ static int hf_audio_agent_transport_acquire(pa_bluetooth_transport *t, bool opti
         dbus_error_init(&derr);
         pa_assert_se(m = dbus_message_new_method_call(t->owner, t->path, "org.ofono.HandsfreeAudioCard", "Connect"));
         r = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(card->backend->connection), m, -1, &derr);
+        dbus_message_unref(m);
+        m = NULL;
+
         if (!r)
             return -1;
 
+        dbus_message_unref(r);
+        r = NULL;
+
         if (card->connecting)
             return -EAGAIN;
     }

src/modules/bluetooth/bluez4-util.c

@@ -1116,6 +1116,8 @@ int pa_bluez4_transport_acquire(pa_bluez4_transport *t, bool optional, size_t *i
     pa_assert_se(m = dbus_message_new_method_call(t->owner, t->path, "org.bluez.MediaTransport", "Acquire"));
     pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_STRING, &accesstype, DBUS_TYPE_INVALID));
     r = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->device->discovery->connection), m, -1, &err);
+    dbus_message_unref(m);
+    m = NULL;
 
     if (!r) {
         dbus_error_free(&err);
@@ -1143,7 +1145,7 @@ fail:
 
 void pa_bluez4_transport_release(pa_bluez4_transport *t) {
     const char *accesstype = "rw";
-    DBusMessage *m;
+    DBusMessage *m, *r;
     DBusError err;
 
     pa_assert(t);
@@ -1154,7 +1156,13 @@ void pa_bluez4_transport_release(pa_bluez4_transport *t) {
 
     pa_assert_se(m = dbus_message_new_method_call(t->owner, t->path, "org.bluez.MediaTransport", "Release"));
     pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_STRING, &accesstype, DBUS_TYPE_INVALID));
-    dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->device->discovery->connection), m, -1, &err);
+    r = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->device->discovery->connection), m, -1, &err);
+    dbus_message_unref(m);
+    m = NULL;
+    if (r) {
+        dbus_message_unref(r);
+        r = NULL;
+    }
 
     if (dbus_error_is_set(&err)) {
         pa_log("Failed to release transport %s: %s", t->path, err.message);

src/modules/bluetooth/bluez5-util.c

@@ -363,6 +363,8 @@ static int bluez5_transport_acquire_cb(pa_bluetooth_transport *t, bool optional,
     dbus_error_init(&err);
 
     r = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->device->discovery->connection), m, -1, &err);
+    dbus_message_unref(m);
+    m = NULL;
     if (!r) {
         if (optional && pa_streq(err.name, "org.bluez.Error.NotAvailable"))
             pa_log_info("Failed optional acquire of unavailable transport %s", t->path);
@@ -393,7 +395,7 @@ finish:
 }
 
 static void bluez5_transport_release_cb(pa_bluetooth_transport *t) {
-    DBusMessage *m;
+    DBusMessage *m, *r;
     DBusError err;
 
     pa_assert(t);
@@ -408,7 +410,13 @@ static void bluez5_transport_release_cb(pa_bluetooth_transport *t) {
     }
 
     pa_assert_se(m = dbus_message_new_method_call(t->owner, t->path, BLUEZ_MEDIA_TRANSPORT_INTERFACE, "Release"));
-    dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->device->discovery->connection), m, -1, &err);
+    r = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->device->discovery->connection), m, -1, &err);
+    dbus_message_unref(m);
+    m = NULL;
+    if (r) {
+        dbus_message_unref(r);
+        r = NULL;
+    }
 
     if (dbus_error_is_set(&err)) {
         pa_log_error("Failed to release transport %s: %s", t->path, err.message);

src/modules/reserve.c

@@ -474,6 +474,9 @@ int rd_acquire(
 		goto fail;
 	}
 
+        dbus_message_unref(m);
+        m = NULL;
+
 	if (!dbus_message_get_args(
 		    reply,
 		    error,
@@ -483,6 +486,9 @@ int rd_acquire(
 		goto fail;
 	}
 
+        dbus_message_unref(reply);
+        reply = NULL;
+
 	if (!good) {
 		r = -EBUSY;
 		goto fail;