[PATCH] iio: temperature: tsys01: fix broken PROM checksum validation

[Salah Triki]

The CRC check function was incorrectly using only the first word of the
PROM (n_prom[0]) instead of iterating through all words. This caused
the driver to fail probing on most devices due to incorrect checksum
calculation.

- Fix loop to use the correct index n_prom[cnt].
- Ensure all bytes are summed as per the datasheet specification.

Fixes: 43e53407f680 ("Add tsys01 meas-spec driver support")
Signed-off-by: Salah Triki <salah.triki@xxxxxxxxx>
---
 drivers/iio/temperature/tsys01.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/temperature/tsys01.c b/drivers/iio/temperature/tsys01.c
index 334bba6fdae6..104dd45598b0 100644
--- a/drivers/iio/temperature/tsys01.c
+++ b/drivers/iio/temperature/tsys01.c
@@ -119,7 +119,7 @@ static bool tsys01_crc_valid(u16 *n_prom)
 	u8 sum = 0;
 
 	for (cnt = 0; cnt < TSYS01_PROM_WORDS_NB; cnt++)
-		sum += ((n_prom[0] >> 8) + (n_prom[0] & 0xFF));
+		sum += ((n_prom[cnt] >> 8) + (n_prom[cnt] & 0xFF));
 
 	return (sum == 0);
 }
-- 
2.43.0