[tracker] libtracker-miner: Fix some memory leaks of TrackerTask

[Carlos Garnacho <carlosg src gnome org>]

commit a3d3516f9926233e1391bbd4b30d2a6259808732
Author: Haithem BEN GHORBAL <haithem benghorbal gmail com>
Date:   Thu Feb 11 14:03:36 2016 +0100

    libtracker-miner: Fix some memory leaks of TrackerTask
    
    These leaks had huge impact as each TrackerTask had a reference
    to a GFile, which prevent them to be removed from TrackerFileSystem
    when calling tracker_file_system_forget_files(). Due to this behavior,
    adding/removing/re-adding folders resulted in some folders/files not
    being indexed.

 src/libtracker-miner/tracker-miner-fs.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-miner-fs.c b/src/libtracker-miner/tracker-miner-fs.c
index 5428586..b3fa7fc 100644
--- a/src/libtracker-miner/tracker-miner-fs.c
+++ b/src/libtracker-miner/tracker-miner-fs.c
@@ -1647,6 +1647,7 @@ item_remove (TrackerMinerFS *fs,
                                            G_PRIORITY_DEFAULT,
                                            sparql_buffer_task_finished_cb,
                                            fs);
+               tracker_task_unref (task);
        }
 
        g_object_unref (builder);
@@ -1677,6 +1678,7 @@ item_remove (TrackerMinerFS *fs,
                                            G_PRIORITY_DEFAULT,
                                            sparql_buffer_task_finished_cb,
                                            fs);
+               tracker_task_unref (task);
 
                /* SECOND:
                 * Actually remove all resources. This operation is the one which may take
@@ -1697,6 +1699,7 @@ item_remove (TrackerMinerFS *fs,
                                            G_PRIORITY_DEFAULT,
                                            sparql_buffer_task_finished_cb,
                                            fs);
+               tracker_task_unref (task);
        }
 
        if (!tracker_task_pool_limit_reached (TRACKER_TASK_POOL (fs->priv->sparql_buffer))) {
@@ -2020,6 +2023,7 @@ item_move (TrackerMinerFS *fs,
                                    G_PRIORITY_DEFAULT,
                                    sparql_buffer_task_finished_cb,
                                    fs);
+       tracker_task_unref (task);
 
        if (!tracker_task_pool_limit_reached (TRACKER_TASK_POOL (fs->priv->sparql_buffer))) {
                item_queue_handlers_set_up (fs);