Fix the following coccicheck warnings:

./tools/thermal/thermometer/thermometer.c:147:3-4: Unneeded semicolon.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220427030619.81556-2-jiapeng.chong@linux.alibaba.comSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>