tracker-monitor: Prevent stack smashing
Make sure to use GPOINTER_TO_UINT when using g_hash_table_lookup_extended() to prevent stack smashing. This will make sure that in the architectures where sizeof(GFileMonitorEvent) < sizeof(gpointer), g_hash_table_lookup_extended() will not write more bytes than prev_event_type can hold.
Fixes: #71 (closed)