[gitg] Fix getting correct parent for merge diff

[Jesse van den Kieboom <jessevdk src gnome org>]

commit e498031dff76586416662c2611e46210fed0038a
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sun Dec 14 19:17:00 2014 +0100

    Fix getting correct parent for merge diff

 libgitg/gitg-commit.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgitg/gitg-commit.vala b/libgitg/gitg-commit.vala
index 2f16aa2..47f1fe3 100644
--- a/libgitg/gitg-commit.vala
+++ b/libgitg/gitg-commit.vala
@@ -133,7 +133,7 @@ public class Commit : Ggit.Commit
                        {
                                for (var i = 0; i < parents.size; ++i)
                                {
-                                       var parent = parents.get(0);
+                                       var parent = parents[i];
 
                                        if (i == 0)
                                        {