[tracker-miners] miners/fs: Fix compile warning with GLib >= 2.64

[Sam Thursfield <sthursfield src gnome org>]

commit 1b78faca40be742662f289b93d7938e676c0bb53
Author: Sam Thursfield <sam afuera me uk>
Date:   Mon Sep 21 17:29:56 2020 +0200

    miners/fs: Fix compile warning with GLib >= 2.64

 src/miners/fs/tracker-main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/miners/fs/tracker-main.c b/src/miners/fs/tracker-main.c
index 271041b12..bd4a484e0 100644
--- a/src/miners/fs/tracker-main.c
+++ b/src/miners/fs/tracker-main.c
@@ -1138,7 +1138,7 @@ main (gint argc, gchar *argv[])
 
 #if GLIB_CHECK_VERSION (2, 64, 0)
        memory_monitor = g_memory_monitor_dup_default ();
-       g_signal_connect (memory_monitor, "low-memory-warning", on_low_memory, NULL);
+       g_signal_connect (memory_monitor, "low-memory-warning", G_CALLBACK (on_low_memory), NULL);
 #endif
 
        /* Preempt creation of graphs */