Staging: netlogic: fix missing free_netdev() on error in xlr_net_probe()

Fix missing free_netdev() before return from function xlr_net_probe()
in the devm_ioremap_resource() error handling case.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>