Git: Disambiguate revision from path on log

If you have a file with the same name as the current branch (in the
repo's root), Push to Gerrit opens with an empty list.

Change-Id: I607c67b1d00da83d4551d3f3f75e5a91478294d5
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/git/logchangedialog.cpp

@@ -157,6 +157,7 @@ bool LogChangeWidget::populateLog(const QString &repository, const QString &comm
     arguments << (commit.isEmpty() ? "HEAD" : commit);
     if (!(flags & IncludeRemotes))
         arguments << "--not" << "--remotes";
+    arguments << "--";
     QString output;
     if (!GitPlugin::client()->synchronousLog(repository, arguments, &output, 0, VcsCommand::NoOutput))
         return false;