[vala-extra-vapis] libgsasl: Return value of Context.client_suggest_mechanism() is nullable

[Rico Tzschichholz <ricotz src gnome org>]

commit b7118a617dcb7ad589025893eef7ae746e67bde9
Author: Jelmer Vernooij <jelmer google com>
Date:   Wed Jan 23 22:11:52 2019 +0000

    libgsasl: Return value of Context.client_suggest_mechanism() is nullable

 libgsasl.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgsasl.vapi b/libgsasl.vapi
index 73005e2..6cb3e9a 100644
--- a/libgsasl.vapi
+++ b/libgsasl.vapi
@@ -141,7 +141,7 @@ namespace Gsasl {
 
                public Gsasl.Result client_mechlist (out string mechlist);
                public Gsasl.Result client_support_p (string name);
-               public unowned string client_suggest_mechanism (string mechlist);
+               public unowned string? client_suggest_mechanism (string mechlist);
 
                public Gsasl.Result server_mechlist (out string mechlist);
                public Gsasl.Result server_support_p (string name);