hostap: Remove set but unused variable 'hostscan'

hostap: Remove set but unused variable 'hostscan'

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/intersil/hostap/hostap_ioctl.c: In function ‘prism2_translate_scan’:
 drivers/net/wireless/intersil/hostap/hostap_ioctl.c:1958:13: warning: variable ‘hostscan’ set but not used [-Wunused-but-set-variable]

Cc: Jouni Malinen <j@w1.fi>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200819072402.3085022-29-lee.jones@linaro.org