[vala] Fix error messages for unsupported signal parameters

[Jürg Billeter <juergbi src gnome org>]

commit fac5b14a6edc3edc0a2c9be988b9b7ba25bf4c30
Author: Jürg Billeter <j bitron ch>
Date:   Tue Oct 20 18:38:49 2009 +0200

    Fix error messages for unsupported signal parameters
    
    Fixes bug 598865.

 vala/valastruct.vala |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/vala/valastruct.vala b/vala/valastruct.vala
index 971d0e3..49177f2 100644
--- a/vala/valastruct.vala
+++ b/vala/valastruct.vala
@@ -532,6 +532,9 @@ public class Vala.Struct : TypeSymbol {
 			}
 			if (is_simple_type ()) {
 				Report.error (source_reference, "The type `%s` doesn't declare a marshaller type name".printf (get_full_name ()));
+				// set marshaller_type_name to avoid multiple errors
+				marshaller_type_name = "";
+				return "";
 			} else if (has_type_id) {
 				return "BOXED";
 			} else {
@@ -555,7 +558,9 @@ public class Vala.Struct : TypeSymbol {
 			}
 			if (is_simple_type ()) {
 				Report.error (source_reference, "The value type `%s` doesn't declare a GValue get function".printf (get_full_name ()));
-				return null;
+				// set get_value_function to avoid multiple errors
+				get_value_function = "";
+				return "";
 			} else if (has_type_id) {
 				return "g_value_get_boxed";
 			} else {
@@ -576,7 +581,9 @@ public class Vala.Struct : TypeSymbol {
 			}
 			if (is_simple_type ()) {
 				Report.error (source_reference, "The value type `%s` doesn't declare a GValue set function".printf (get_full_name ()));
-				return null;
+				// set set_value_function to avoid multiple errors
+				set_value_function = "";
+				return "";
 			} else if (has_type_id) {
 				return "g_value_set_boxed";
 			} else {