g_utf8_normalize: Doc comment return missing nullable annotation
g_utf8_normalize: Doc comment return missing nullable annotation

The return value for g_utf8_normalize may be null, but the return type
is not annotated as such. This is important for language bindings for
langs that are about nullability, such as Vala and Haskell.

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib