greybus: remove excessive check in gb_connection_hd_cport_quiesce()

Function pointer "hd->driver->cport_quiesce" is already checked
at the beginning of gb_connection_hd_cport_quiesce(). Thus, the
second check can be removed.

Signed-off-by: Denis Efremov <[e-mail]>
Acked-by: Johan Hovold <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/greybus/connection.c

···
 	if (connection->mode_switch)
 		peer_space += sizeof(struct gb_operation_msg_hdr);
 
-	if (!hd->driver->cport_quiesce)
-		return 0;
-
 	ret = hd->driver->cport_quiesce(hd, connection->hd_cport_id,
 					peer_space,
 					GB_CONNECTION_CPORT_QUIESCE_TIMEOUT);