[PATCH] hwmon: (pmbus/ibm-cffps) fix format-truncation warning

[hanzhijian]

snprintf() with "%02X" and "%04X" specifiers on an int argument
triggers -Wformat-truncation (and thus a build failure with
CONFIG_WERROR) because GCC assumes the int can hold a value wider
than the destination buffer.

The value comes from i2c_smbus_read_byte_data() and
i2c_smbus_read_word_data(), which return at most 8 and 16 bits
respectively, so mask the value to make that explicit and silence
the warning.

Signed-off-by: hanzhijian <hanzhijian1991@xxxxxxxxx>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index aad94bcb9..dd7ff3a19 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -166,7 +166,7 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 				if (rc < 0)
 					goto unlock;
 
-				snprintf(&data[i * 2], 3, "%02X", rc);
+				snprintf(&data[i * 2], 3, "%02X", rc & 0xff);
 			}
 
 			rc = i * 2;
@@ -177,7 +177,7 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 				if (rc < 0)
 					goto unlock;
 
-				snprintf(&data[i * 4], 5, "%04X", rc);
+				snprintf(&data[i * 4], 5, "%04X", rc & 0xffff);
 			}
 
 			rc = i * 4;
-- 
2.43.0