[tracker/wip/carlosg/coverity-warnings: 14/18] libtracker-sparql: Plug leak on API misuse

[Carlos Garnacho <carlosg src gnome org>]

commit 210cfeecfdfd41a0bc5010b138c05a40a06cf2bb
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Mar 20 13:23:18 2021 +0100

    libtracker-sparql: Plug leak on API misuse
    
    If we use the g_return_val_if_fail(), the string builder is leaked.
    
    CID: #1501138

 src/libtracker-sparql/tracker-namespace-manager.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/libtracker-sparql/tracker-namespace-manager.c 
b/src/libtracker-sparql/tracker-namespace-manager.c
index e9b2456fd..c0e5f90bb 100644
--- a/src/libtracker-sparql/tracker-namespace-manager.c
+++ b/src/libtracker-sparql/tracker-namespace-manager.c
@@ -300,7 +300,7 @@ char *
 tracker_namespace_manager_print_turtle (TrackerNamespaceManager *self)
 {
        TrackerNamespaceManagerPrivate *priv;
-       GString *result = g_string_new ("");
+       GString *result;
        GHashTableIter iter;
        const char *prefix;
        const char *namespace;
@@ -309,6 +309,8 @@ tracker_namespace_manager_print_turtle (TrackerNamespaceManager *self)
 
        priv = GET_PRIVATE (self);
 
+       result = g_string_new ("")
+
        g_hash_table_iter_init (&iter, priv->prefix_to_namespace);
        while (g_hash_table_iter_next (&iter, (gpointer *)&prefix, (gpointer *)&namespace)) {
                g_string_append_printf (result, "@prefix %s: <%s> .\n", prefix, namespace);