BACKPORT: mac80211_hwsim: fix a possible memory leak in hwsim_new_radio_nl()

'hwname' should be freed before leaving from the error handling cases,
otherwise it will cause mem leak

Bug: 254441685
Fixes: cb1a5bae ("mac80211_hwsim: add permanent mac address option for new radios")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit e8f90c74)
[Lee: Resolved simple conflict]
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ia902a1b2e0adc73c7103e36ca8e3cd19e2bb768d