hwmon: (nct6775-core) Fix underflows seen when writing limit attributes

[ Upstream commit 0403e10bf0824bf0ec2bb135d4cf1c0cc3bf4bf0 ]

DIV_ROUND_CLOSEST() after kstrtol() results in an underflow if a large
negative number such as -9223372036854775808 is provided by the user.
Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>