[pitivi] utils:pipeline: Fix seek failure exception message

[Thibault Saunier <tsaunier src gnome org>]

commit 6ee0c638c7209c1e2fa0629a24055bb05b9f5144
Author: Thibault Saunier <tsaunier gnome org>
Date:   Mon Nov 10 18:09:24 2014 +0100

    utils:pipeline: Fix seek failure exception message

 pitivi/utils/pipeline.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/utils/pipeline.py b/pitivi/utils/pipeline.py
index d055e57..7fadf08 100644
--- a/pitivi/utils/pipeline.py
+++ b/pitivi/utils/pipeline.py
@@ -407,7 +407,7 @@ class SimplePipeline(GObject.Object, Loggable):
         self._timeout_async_id = GLib.timeout_add(1000, self._resetWaitingForAsyncDone)
 
         if not res:
-            raise PipelineError("seek failed: %s" % position)
+            raise PipelineError(self.get_name() + " seek failed: " + str(position))
 
         self.lastPosition = position