[vala] Fix regression when assigning owned expressions to unowned variables.

[Luca Bruno <lucabru src gnome org>]

commit ba1fa0759989dcbb9046c7dfc06cce6c4aa23411
Author: Luca Bruno <luca bruno immobiliare it>
Date:   Thu Sep 4 18:26:21 2014 +0200

    Fix regression when assigning owned expressions to unowned variables.
    
    The regression was introduced by db462e6f919da758fb.
    
    Fixes bug 736016

 vala/valasemanticanalyzer.vala |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/vala/valasemanticanalyzer.vala b/vala/valasemanticanalyzer.vala
index 0cdd878..2f1be1b 100644
--- a/vala/valasemanticanalyzer.vala
+++ b/vala/valasemanticanalyzer.vala
@@ -892,8 +892,7 @@ public class Vala.SemanticAnalyzer : CodeVisitor {
        public static Expression create_temp_access (LocalVariable local, DataType? target_type) {
                Expression temp_access = new MemberAccess.simple (local.name, local.source_reference);
 
-               var target_owned = target_type == null || target_type.value_owned;
-               if (target_owned && local.variable_type.is_disposable ()) {
+               if (local.variable_type.is_disposable ()) {
                        temp_access = new ReferenceTransferExpression (temp_access, local.source_reference);
                        temp_access.target_type = target_type != null ? target_type.copy () : 
local.variable_type.copy ();
                        temp_access.target_type.value_owned = true;