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/net/wireless/libertas/cmd.c b/drivers/net/wireless/libertas/cmd.c
index 639dd02..8c3605c 100644
--- a/drivers/net/wireless/libertas/cmd.c
+++ b/drivers/net/wireless/libertas/cmd.c
@@ -1649,7 +1649,7 @@
 
 /**
  *  @brief This function executes next command in command
- *  pending queue. It will put fimware back to PS mode
+ *  pending queue. It will put firmware back to PS mode
  *  if applicable.
  *
  *  @param priv     A pointer to struct lbs_private structure