rtlwifi: remove redundant initialization of variable ul_encalgo

Variable ul_encalgo is initialized with a value that is never read,
it is being re-assigned a new value in every case in the following
switch statement. The initialization is redundant and can be removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220130223714.6999-1-colin.i.king@gmail.com