samples: net: zperf: Fix udp.upload command

The IP address and port number were incorrectly parsed if
user used udp.upload command.

Change-Id: Ib37d481012af5e186a1e342c92d10ddef9fe35b1
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
1 file changed