[goffice] file: undo over-eager preconditions

[Morten Welinder <mortenw src gnome org>]

commit ca55298ed8b157db93db0fc89397b579f63c7cea
Author: Morten Welinder <terra gnome org>
Date:   Fri Apr 13 20:53:02 2018 -0400

    file: undo over-eager preconditions

 goffice/app/file.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/goffice/app/file.c b/goffice/app/file.c
index b04c0c4..f5caffb 100644
--- a/goffice/app/file.c
+++ b/goffice/app/file.c
@@ -140,7 +140,7 @@ go_file_opener_probe_real (GOFileOpener const *fo, GsfInput *input,
        gboolean ret = FALSE;
 
        if (fo->probe_func != NULL) {
-               ret =  fo->probe_func (fo, input, pl);
+               ret = fo->probe_func (fo, input, pl);
                gsf_input_seek (input, 0, G_SEEK_SET);
        }
        return ret;
@@ -237,7 +237,6 @@ go_file_opener_setup (GOFileOpener *fo, gchar const *id,
 {
        g_return_if_fail (GO_IS_FILE_OPENER (fo));
        g_return_if_fail (description != NULL);
-       g_return_if_fail (open_func != NULL);
 
        fo->id = g_strdup (id);
        fo->description = g_strdup (description);
@@ -744,7 +743,6 @@ go_file_saver_new (gchar const *id,
        GOFileSaver *fs;
 
        g_return_val_if_fail (description != NULL, NULL);
-       g_return_val_if_fail (save_func != NULL, NULL);
 
        fs = GO_FILE_SAVER (g_object_new (GO_TYPE_FILE_SAVER,
                                          "id", id,