libertas: Fix misnaming for function param 'device'

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

 drivers/net/wireless/marvell/libertas/firmware.c:134: warning: Function parameter or member 'device' not described in 'lbs_get_firmware_async'
 drivers/net/wireless/marvell/libertas/firmware.c:134: warning: Excess function parameter 'dev' description in 'lbs_get_firmware_async'

Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: libertas-dev@lists.infradead.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/20200819072402.3085022-27-lee.jones@linaro.org

drivers/net/wireless/marvell/libertas/firmware.c

@@ -121,12 +121,12 @@ void lbs_wait_for_firmware_load(struct lbs_private *priv)
  *  either a helper firmware and a main firmware (2-stage), or just the helper.
  *
  *  @priv:      Pointer to lbs_private instance
- *  @dev:     	A pointer to &device structure
+ *  @device:   	A pointer to &device structure
  *  @card_model: Bus-specific card model ID used to filter firmware table
  *		elements
  *  @fw_table:	Table of firmware file names and device model numbers
  *		terminated by an entry with a NULL helper name
- *	@callback: User callback to invoke when firmware load succeeds or fails.
+ *  @callback:	User callback to invoke when firmware load succeeds or fails.
  */
 int lbs_get_firmware_async(struct lbs_private *priv, struct device *device,
 			    u32 card_model, const struct lbs_fw_table *fw_table,