trivial: Fix misspelling of firmware

Fix misspelling of firmware.

Signed-off-by: Nick Andrew <nick@nick-andrew.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index d243320..814cb65 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -5811,7 +5811,7 @@
  *	ThinkPads from this same time period (and earlier) probably lack the
  *	tachometer as well.
  *
- *	Unfortunately a lot of ThinkPads with new-style ECs but whose firwmare
+ *	Unfortunately a lot of ThinkPads with new-style ECs but whose firmware
  *	was never fixed by IBM to report the EC firmware version string
  *	probably support the tachometer (like the early X models), so
  *	detecting it is quite hard.  We need more data to know for sure.