Remove unnecessary memory handling.

It all gets cleaned up when the GitHandler object goes out of scope
anyway.

src/backend/helpers/git_helper.cpp

@@ -169,14 +169,6 @@ namespace loot {
         payload.fileToFind = filename.c_str();
         git.Call(git_diff_foreach(git.diff, &git.diff_file_cb, NULL, NULL, NULL, &payload));
 
-        // Clean up memory
-        git_object_free(git.obj);
-        git.obj = nullptr;
-        git_tree_free(git.tree);
-        git.tree = nullptr;
-        git_diff_free(git.diff);
-        git.diff = nullptr;
-
         return payload.fileFound;
     }
 }

src/backend/masterlist.cpp

@@ -76,10 +76,6 @@ namespace loot {
         out << boost::locale::as::ftime("%Y-%m-%d") << dateTime;
         info.date = out.str();
 
-        // Free object memory.
-        git_object_free(git.obj);
-        git.obj = nullptr;
-
         BOOST_LOG_TRIVIAL(trace) << "Diffing masterlist HEAD and working copy.";
         if (IsFileDifferent(path.parent_path(), path.filename().string())) {
             info.revision += string(" ") + lc::translate("(edited)").str();