serial:ifx6x60: Remove memset for SPI frame

There is no need to memset 0 to SPI frame memory before preparing transfer frame bits, because SPI frame header are encoded with valid data size, so don't need to worry about adopting dirty bits, more, memset zero for each SPI frame may impact the spi throughput efficiency.

---
 drivers/tty/serial/ifx6x60.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

index 8cb6d8d..fa4ec7e 100644
@@ -481,7 +481,6 @@ static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
 	unsigned char *tx_buffer;
 
 	tx_buffer = ifx_dev->tx_buffer;
-	memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
 
 	/* make room for required SPI header */
 	tx_buffer += IFX_SPI_HEADER_OVERHEAD;

1.7.1