trivial: Fix misspelling of "Celsius".

A few comments say "Celcius"; this fixes them. No code changes.

Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 99e6f1f..0c30ec0 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -367,7 +367,7 @@
 		/*
 		 * Treat freezing temperatures as invalid as well; some
 		 * BIOSes return really low values and cause reboots at startup.
-		 * Below zero (Celcius) values clearly aren't right for sure..
+		 * Below zero (Celsius) values clearly aren't right for sure..
 		 * ... so lets discard those as invalid.
 		 */
 		if (ACPI_FAILURE(status) ||