net: sealevel: open brace '{' following struct go on the same line

Fix the checkpatch error as open brace '{' following struct should
go on the same line.
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NGuangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/wan/sealevel.c

@@ -29,14 +29,12 @@
 #include <asm/byteorder.h>
 #include "z85230.h"
 
-struct slvl_device
-{
+struct slvl_device {
 	struct z8530_channel *chan;
 	int channel;
 };
 
-struct slvl_board
-{
+struct slvl_board {
 	struct slvl_device dev[2];
 	struct z8530_dev board;
 	int iobase;