Fix external radio work stopping to not read freed memory

Fix external radio work stopping to not read freed memory

The dynamically allocated struct wpa_external_work contains the name of
the radio work in the type field and this is used in a debug print
within radio_work_done(). Re-order radio_work_done() and os_free() calls
on couple of paths where the memory was freed before that final user of
the buffer.

Signed-off-by: Jouni Malinen <j@w1.fi>