gst/gstinfo.c: don't do dummy g_strdup()s

gst/gstinfo.c: don't do dummy g_strdup()s

Original commit message from CVS:
* gst/gstinfo.c: (gst_debug_log_default):
don't do dummy g_strdup()s
* libs/gst/controller/gstcontroller.c:
(on_object_controlled_property_changed),
(gst_controlled_property_new), (gst_controller_new_valist),
(gst_controller_new_list),
(gst_controller_remove_properties_valist), (gst_controller_set),
(gst_controller_get), (gst_controller_sync_values),
(gst_controller_get_value_array), (_gst_controller_class_init),
(gst_controller_get_type):
* libs/gst/controller/gstcontroller.h:
* libs/gst/controller/gstinterpolation.c:
(gst_controlled_property_find_timed_value_node):
convert // to /**/ comments