ath6kl: spell "distribution" correctly in a comment.

This fixes two misspellings of "distribution" in a comment.
Signed-off-by: NNik Nyby <nikolas@gnu.org>
Signed-off-by: NKalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/htc.h

@@ -427,7 +427,7 @@ struct htc_endpoint_credit_dist {
 };
 
 /*
- * credit distibution code that is passed into the distrbution function,
+ * credit distribution code that is passed into the distribution function,
  * there are mandatory and optional codes that must be handled
  */
 enum htc_credit_dist_reason {