tools/lib/thermal: remove unneeded semicolon

Fix the following coccicheck warnings:

./tools/lib/thermal/commands.c:215:2-3: 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/20220427030619.81556-1-jiapeng.chong@linux.alibaba.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Author: wb-zjp846396

tools/lib/thermal/commands.c

@@ -212,7 +212,7 @@ static int handle_netlink(struct nl_cache_ops *unused,
 
 	default:
 		return THERMAL_ERROR;
-	};
+	}
 
 	return ret;
 }