[gnome-epub-thumbnailer] epub: Set an error when the cover can't be found

[Bastien Nocera <hadess src gnome org>]

commit 68841e9a7658b6bafd4d94f4199ea047d303f1d3
Author: Bastien Nocera <hadess hadess net>
Date:   Sun Sep 1 17:26:13 2013 +0200

    epub: Set an error when the cover can't be found
    
    This stops a crash in the thumbnailer if the cover cannot
    be found.

 gnome-epub-thumbnailer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gnome-epub-thumbnailer.c b/gnome-epub-thumbnailer.c
index e2a3615..1cb8149 100644
--- a/gnome-epub-thumbnailer.c
+++ b/gnome-epub-thumbnailer.c
@@ -283,7 +283,7 @@ file_to_data (const char  *path,
        }
 
        if (cover_data == NULL) {
-               g_warning ("Could not find cover file in '%s'", path);
+               g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Could not find cover file");
                return NULL;
        }