[vala/staging] vala: Check before accessing "name" of parent_symbol which might be null

[Rico Tzschichholz <ricotz src gnome org>]

commit 6465dbb7e8618f7b33a4233b9369ec9d0195ab15
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Dec 9 12:15:44 2019 +0100

    vala: Check before accessing "name" of parent_symbol which might be null

 vala/valadatatype.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vala/valadatatype.vala b/vala/valadatatype.vala
index e968ec989..7dd0e8dcb 100644
--- a/vala/valadatatype.vala
+++ b/vala/valadatatype.vala
@@ -134,7 +134,7 @@ public abstract class Vala.DataType : CodeNode {
 
                if (type_symbol != null) {
                        Symbol global_symbol = type_symbol;
-                       while (global_symbol.parent_symbol.name != null) {
+                       while (global_symbol.parent_symbol != null && global_symbol.parent_symbol.name != 
null) {
                                global_symbol = global_symbol.parent_symbol;
                        }