[PATCH] tpm: tpm_tis_spi: Initialize ret variable in tpm_tis_spi_transfer_half()

[Alper Ak]

When len is 0, the while loop in tpm_tis_spi_transfer_half() is never
entered and the function returns an uninitialized ret variable.

Initialize ret to 0 to correctly handle this case. This is consistent
with tpm_tis_spi_transfer_full(), which already initializes ret to 0
before the loop.

Fixes: a86a42ac2bd6 ("tpm_tis_spi: Add hardware wait polling")
Signed-off-by: Alper Ak <alperyasin...@gmail.com>
---
 drivers/char/tpm/tpm_tis_spi_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_tis_spi_main.c 
b/drivers/char/tpm/tpm_tis_spi_main.c
index 61b42c83ced8..1b6d79662ca1 100644
--- a/drivers/char/tpm/tpm_tis_spi_main.c
+++ b/drivers/char/tpm/tpm_tis_spi_main.c
@@ -85,7 +85,7 @@ static int tpm_tis_spi_transfer_half(struct tpm_tis_data 
*data,       u32 addr,
        struct spi_transfer spi_xfer[3];
        struct spi_message m;
        u8 transfer_len;
-       int ret;
+       int ret = 0;
 
        while (len) {
                transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);
-- 
2.43.0