commands: ubiupdatevol: confirm success with return value 0
Treat the write() case analogously to the read() case and do not return the
number of most recently written bytes as the status of sucessful command
execution.
Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>