[rygel] media-export: Remove cache file on error

[Jens Georg <jensgeorg src gnome org>]

commit 394996f7f777bdb0ec5a57a7be795fd21f9fec8e
Author: Jens Georg <mail jensge org>
Date:   Sun Jan 3 13:07:27 2016 +0100

    media-export: Remove cache file on error
    
    Prevent that we read an empty or partial file from chache if we have to
    re-index for some reason.
    
    Signed-off-by: Jens Georg <mail jensge org>

 .../rygel-media-export-dvd-parser.vala             |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-dvd-parser.vala 
b/src/plugins/media-export/rygel-media-export-dvd-parser.vala
index 8aa03ac..d4df13b 100644
--- a/src/plugins/media-export/rygel-media-export-dvd-parser.vala
+++ b/src/plugins/media-export/rygel-media-export-dvd-parser.vala
@@ -87,6 +87,11 @@ internal class Rygel.DVDParser : GLib.Object {
             if (!(process.get_if_exited () &&
                 process.get_exit_status () == 0)) {
                 throw new DVDParserError.GENERAL ("lsdvd did die or file is not a DVD");
+                try {
+                    this.cache_file.delete (null);
+                } catch (Error error) {
+                    debug ("Failed to delete cache file: %s", error.message);
+                }
             }
         }