The attached patch cleans up the error handling in mkyaffsimage a
little bit.

Some functions return an error value, others directly set the
global variable "error".  The patch converts all usage to the
function error return model.

In process_directory(), added a printf() of the name of the
unhandled object to the "we don't handle this type" error
message.

In process_directory(), stop scanning as soon as an error
occurs.  (This may be a controversial change, but it seemed
good to me to make the failure obvious, and not hidden in
the output of files that were properly processed.)

-Frank
-- 
Frank Rowand <frank_rowand@mvista.com>
MontaVista Software, Inc