Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/net/wireless/libertas/cfg.c b/drivers/net/wireless/libertas/cfg.c
index 30ef035..5caa2ac 100644
--- a/drivers/net/wireless/libertas/cfg.c
+++ b/drivers/net/wireless/libertas/cfg.c
@@ -1350,7 +1350,7 @@
 		 * we remove all keys like in the WPA/WPA2 setup,
 		 * we just don't set RSN.
 		 *
-		 * Therefore: fall-throught
+		 * Therefore: fall-through
 		 */
 	case WLAN_CIPHER_SUITE_TKIP:
 	case WLAN_CIPHER_SUITE_CCMP: