gst/gstregistry.c: When replacing an existing feature in the registry, make sure...

gst/gstregistry.c: When replacing an existing feature in the registry, make sure to continue holding a reference unti...

Original commit message from CVS:
* gst/gstregistry.c: (gst_registry_add_feature):
When replacing an existing feature in the registry, make sure to
continue holding a reference until we've replaced the name string
within our feature hash table. Make sure to use g_hash_table_replace
instead of g_hash_table_insert to ensure the new name string is used
as a key instead of the old one that we're about to free.
Fixes: #462085