spi: spi-mtk-nor: Fix checkpatch spacing error

Fix checkpatch error:

  ERROR: space required before the open parenthesis '('
  torvalds#295: FILE: spi-mtk-nor.c:295:
  +		switch(op->data.dir) {

Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/1616566602-13894-6-git-send-email-f.fangjian@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-mtk-nor.c

@@ -292,7 +292,7 @@ static bool mtk_nor_supports_op(struct spi_mem *mem,
 		return false;
 
 	if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
-		switch(op->data.dir) {
+		switch (op->data.dir) {
 		case SPI_MEM_DATA_IN:
 			if (mtk_nor_match_read(op))
 				return true;