Re: [PATCH] Input: ads7846 - Increase xfer array size in 'struct ser_req'

Clang warns (or errors with CONFIG_WERROR=y, trimmed for brevity):

   drivers/input/touchscreen/ads7846.c:412:2: error: array index 6 is past the end of the array (that has type 'struct spi_transfer[6]') [-Werror,-Warray-bounds]
     412 |         req->xfer[6].tx_buf = &req->scratch;
         |         ^         ~
   ...
   drivers/input/touchscreen/ads7846.c:416:2: error: array index 7 is past the end of the array (that has type 'struct spi_transfer[6]') [-Werror,-Warray-bounds]
     416 |         req->xfer[7].rx_buf = &req->scratch;
         |         ^         ~
   drivers/input/touchscreen/ads7846.c:334:2: note: array 'xfer' declared here
     334 |         struct spi_transfer     xfer[6];
         |         ^

Increase the size of xfer in 'struct ser_req' to ensure that there is
enough space for all necessary members and there are no out of bounds
accesses, clearing up the warning.

Fixes: 781a07da9bb9 ("Input: ads7846 - add dummy command register clearing cycle")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
  drivers/input/touchscreen/ads7846.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index f7bc0a3e56d86932823b6bc0dcd6bcd8e1b9b5c2..7b3711a3597c86f18c45d040f73bef884ec3c4aa 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c

@@ -331,7 +331,7 @@ struct ser_req {
  	u8			ref_off;
  	u16			scratch;
  	struct spi_message	msg;
-	struct spi_transfer	xfer[6];
+	struct spi_transfer	xfer[8];