[evince] comics: Propagate an error if the mime-type cannot be read

[Bastien Nocera <hadess src gnome org>]

commit 14c54a7187e5cbf710ee890a2ed78083f7d048d1
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jul 18 11:52:56 2017 +0200

    comics: Propagate an error if the mime-type cannot be read
    
    And avoid leaking an unused error.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784963

 backend/comics/comics-document.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/backend/comics/comics-document.c b/backend/comics/comics-document.c
index 4ead1dd..b3e028f 100644
--- a/backend/comics/comics-document.c
+++ b/backend/comics/comics-document.c
@@ -219,7 +219,7 @@ comics_document_load (EvDocument *document,
 
        comics_document->archive_uri = g_strdup (uri);
 
-       mime_type = ev_file_get_mime_type (uri, FALSE, &err);
+       mime_type = ev_file_get_mime_type (uri, FALSE, error);
        if (mime_type == NULL)
                return FALSE;