[vala] girparser: Add null check when setting the alias cname

[Luca Bruno <lucabru src gnome org>]

commit 6f1e97ab2ed1cea153041ab4c18888927466e1fd
Author: Luca Bruno <lucabru src gnome org>
Date:   Thu May 5 18:57:12 2011 +0200

    girparser: Add null check when setting the alias cname

 vala/valagirparser.vala |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/vala/valagirparser.vala b/vala/valagirparser.vala
index c0523cc..65b83c2 100644
--- a/vala/valagirparser.vala
+++ b/vala/valagirparser.vala
@@ -2699,7 +2699,10 @@ public class Vala.GirParser : CodeVisitor {
 				st.base_type = base_type;
 			}
 			st.external = true;
-			st.set_cname (alias.girdata["c:type"]);
+			var cname = alias.girdata["c:type"];
+			if (cname != null) {
+				st.set_cname (cname);
+			}
 			if (simple_type) {
 				st.set_simple_type (true);
 			}
@@ -2711,7 +2714,10 @@ public class Vala.GirParser : CodeVisitor {
 				cl.add_base_type (base_type);
 			}
 			cl.external = true;
-			cl.set_cname (alias.girdata["c:type"]);
+			var cname = alias.girdata["c:type"];
+			if (cname != null) {
+				cl.set_cname (cname);
+			}
 			alias.symbol = cl;
 		}
 	}