tools/thermal: remove unneeded semicolon

Fix the following coccicheck warnings:

./tools/thermal/thermometer/thermometer.c:147:3-4: Unneeded semicolon.

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

tools/thermal/thermometer/thermometer.c

···
 		if (!node) {
 			ERROR("Missing node name '%d'\n", i);
 			return -1;
-		};
+		}
 
 		if (!config_setting_lookup_string(node, "name", &name)) {
 			ERROR("Thermal zone name not found\n");