i3c: master: Fix missing 'ret' assignment in set_speed()

Fix a probe failure in the i3c master driver that occurs when no i3c
devices are connected to the bus.

The issue arises in `i3c_master_bus_init()` where the `ret` value is not
updated after calling `master->ops->set_speed()`. If no devices are
present, `ret` remains set to `I3C_ERROR_M2`, causing the code to
incorrectly proceed to `err_bus_cleanup`.

Cc: [email protected]
Fixes: aef79e1 ("i3c: master: support to adjust first broadcast address speed")
Signed-off-by: Frank Li <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
Acked-by: Mukesh Kumar Savaliya <[email protected]>
Reviewed-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Belloni <[email protected]>

Author: nxpfrankli

drivers/i3c/master.c

@@ -1919,7 +1919,7 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
 		goto err_bus_cleanup;
 
 	if (master->ops->set_speed) {
-		master->ops->set_speed(master, I3C_OPEN_DRAIN_NORMAL_SPEED);
+		ret = master->ops->set_speed(master, I3C_OPEN_DRAIN_NORMAL_SPEED);
 		if (ret)
 			goto err_bus_cleanup;
 	}