PlaylistFetcher: clear mStartup for .aac playlists after seek

Bug: 18296856
Change-Id: I26beabee338312eb2125b69284052c61aef611f0
diff --git a/media/libstagefright/httplive/PlaylistFetcher.cpp b/media/libstagefright/httplive/PlaylistFetcher.cpp
index 30fa868..53a99c1 100644
--- a/media/libstagefright/httplive/PlaylistFetcher.cpp
+++ b/media/libstagefright/httplive/PlaylistFetcher.cpp
@@ -1587,6 +1587,7 @@
                 mStartTimeUsNotify->setInt32("streamMask", LiveSession::STREAMTYPE_AUDIO);
                 mStartTimeUsNotify->post();
                 mStartTimeUsNotify.clear();
+                mStartup = false;
             }
         }