soundwire: stream: Fix error return code in do_bank_switch()

Fix to return a negative error code from the error handling case instead
of 0, as done elsewhere in this function.

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220307074039.117488-1-wangwensheng4@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Wang Wensheng

drivers/soundwire/stream.c

@@ -822,6 +822,7 @@ static int do_bank_switch(struct sdw_stream_runtime *stream)
 		} else if (multi_link) {
 			dev_err(bus->dev,
 				"Post bank switch ops not implemented\n");
+			ret = -EINVAL;
 			goto error;
 		}