[gnome-software] trivial: Fix copy-paste typo

[Kalev Lember <klember src gnome org>]

commit 6d8fc61b0af018a8ef3a4dd921c385c26d230fb4
Author: Kalev Lember <klember redhat com>
Date:   Tue May 7 08:29:26 2019 +0200

    trivial: Fix copy-paste typo

 plugins/packagekit/gs-packagekit-helper.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plugins/packagekit/gs-packagekit-helper.h b/plugins/packagekit/gs-packagekit-helper.h
index 08caf444..e3ce8891 100644
--- a/plugins/packagekit/gs-packagekit-helper.h
+++ b/plugins/packagekit/gs-packagekit-helper.h
@@ -24,7 +24,7 @@ void           gs_packagekit_helper_add_app           (GsPackagekitHelper     *self,
                                                         GsApp                  *app);
 void            gs_packagekit_helper_set_progress_app  (GsPackagekitHelper     *self,
                                                         GsApp                  *progress_app);
-GsApp          *gs_packagekit_helper_get_app_by_id     (GsPackagekitHelper     *progress,
+GsApp          *gs_packagekit_helper_get_app_by_id     (GsPackagekitHelper     *self,
                                                         const gchar            *package_id);
 void            gs_packagekit_helper_cb                (PkProgress             *progress,
                                                         PkProgressType          type,