staging: rtl8188eu: refactor rtl88eu_dm_update_rx_idle_ant()

Refactor rtl88eu_dm_update_rx_idle_ant() to reduce indentation level
and clear line over 80 characters checkpatch warnings.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200105194936.5477-2-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/hal/odm_rtl8188e.c

@@ -154,7 +154,9 @@ void rtl88eu_dm_update_rx_idle_ant(struct odm_dm_struct *dm_odm, u8 ant)
 	struct adapter *adapter = dm_odm->Adapter;
 	u32 default_ant, optional_ant;
 
-	if (dm_fat_tbl->RxIdleAnt != ant) {
+	if (dm_fat_tbl->RxIdleAnt == ant)
+		return;
+
 	if (ant == MAIN_ANT) {
 		default_ant = (dm_odm->AntDivType == CG_TRX_HW_ANTDIV) ?
 			       MAIN_ANT_CG_TRX : MAIN_ANT_CGCS_RX;
@@ -182,7 +184,7 @@ void rtl88eu_dm_update_rx_idle_ant(struct odm_dm_struct *dm_odm, u8 ant)
 		phy_set_bb_reg(adapter, ODM_REG_RX_ANT_CTRL_11N,
 			       BIT(8) | BIT(7) | BIT(6), optional_ant);
 	}
-	}
+
 	dm_fat_tbl->RxIdleAnt = ant;
 }