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/usb/serial/ChangeLog.history b/drivers/usb/serial/ChangeLog.history
index c1b2799..f13fd48 100644
--- a/drivers/usb/serial/ChangeLog.history
+++ b/drivers/usb/serial/ChangeLog.history
@@ -715,7 +715,7 @@
 
  0.2 (01/30/2000) greg kroah-hartman
 	Milestone 1 release.
-	Device is found by USB subsystem, enumerated, fimware is downloaded
+	Device is found by USB subsystem, enumerated, firmware is downloaded
 	and the descriptors are printed to the debug log, config is set, and
 	green light starts to blink. Open port works, and data can be sent
 	and received at the default settings of the UART. Loopback connector