If a task such as do_fetch fails when we're extracting source for a
recipe (within devtool modify / upgrade / extract / sync) then we should
naturally stop processing instead of blundering on; in order to do that
we need to be listening for the TaskFailed event. Thanks to Richard
Purdie for noticing and fixing this.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
