soundwire: fix trailing line in sysfs_slave.c

Commit bcac5902 ("soundwire: add Slave sysfs support") added
trailing line in file sysfs_slave.c, so remove it

Fixes: bcac5902 ("soundwire: add Slave sysfs support")
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/sysfs_slave.c

@@ -212,4 +212,3 @@ int sdw_slave_sysfs_init(struct sdw_slave *slave)
 
 	return 0;
 }
-