[tracker] libtracker-miner: Fix "return makes integer from pointer without a cast" warnings

[Carlos Garnacho <carlosg src gnome org>]

commit 6301b69e94247e0a46bca16bb01670af9edfd50a
Author: Haithem BEN GHORBAL <haithem benghorbal gmail com>
Date:   Mon Feb 8 17:53:12 2016 +0100

    libtracker-miner: Fix "return makes integer from pointer without a cast" warnings

 src/libtracker-miner/tracker-crawler.c     |    2 +-
 src/libtracker-miner/tracker-file-system.c |    8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-crawler.c b/src/libtracker-miner/tracker-crawler.c
index 900af77..31fe418 100644
--- a/src/libtracker-miner/tracker-crawler.c
+++ b/src/libtracker-miner/tracker-crawler.c
@@ -1235,7 +1235,7 @@ tracker_crawler_get_file_attributes (TrackerCrawler *crawler)
 gint
 tracker_crawler_get_max_depth (TrackerCrawler *crawler)
 {
-       g_return_val_if_fail (TRACKER_IS_CRAWLER (crawler), NULL);
+       g_return_val_if_fail (TRACKER_IS_CRAWLER (crawler), 0);
        return crawler->priv->max_depth;
 }
 
diff --git a/src/libtracker-miner/tracker-file-system.c b/src/libtracker-miner/tracker-file-system.c
index b53caf2..8a0e691 100644
--- a/src/libtracker-miner/tracker-file-system.c
+++ b/src/libtracker-miner/tracker-file-system.c
@@ -847,12 +847,12 @@ tracker_file_system_get_property_full (TrackerFileSystem *file_system,
        FileNodeProperty property, *match;
        GNode *node;
 
-       g_return_val_if_fail (TRACKER_IS_FILE_SYSTEM (file_system), NULL);
-       g_return_val_if_fail (file != NULL, NULL);
-       g_return_val_if_fail (prop > 0, NULL);
+       g_return_val_if_fail (TRACKER_IS_FILE_SYSTEM (file_system), FALSE);
+       g_return_val_if_fail (file != NULL, FALSE);
+       g_return_val_if_fail (prop > 0, FALSE);
 
        node = file_system_get_node (file_system, file);
-       g_return_val_if_fail (node != NULL, NULL);
+       g_return_val_if_fail (node != NULL, FALSE);
 
        data = node->data;
        property.prop_quark = prop;