Remove unnecessary variable initialization

The following if statements set the new_op_mode value in all cases,
so there is no need to initialize this to 0 first. This removes a
static analyzer warning.

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

src/ap/ieee802_11_ht.c

@@ -139,7 +139,6 @@ int hostapd_ht_operation_update(struct hostapd_iface *iface)
 		op_mode_changes++;
 	}
 
-	new_op_mode = 0;
 	if (iface->num_sta_no_ht)
 		new_op_mode = OP_MODE_MIXED;
 	else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)