net/bonding: fix check slaves link properties

net/bonding: fix check slaves link properties

Result of slaves link properties validation is not used when new slave
is added.

This patch uses the value of link_properties_valid() to determinate if
slave can be used in the bonding. If function fails, error is returned
preventing to add slave with invalid link properties.

Coverity issue: 158661
Fixes: deba8a2f8b0b ("net/bonding: fix link properties management")
Cc: stable@dpdk.org
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>