libertas: fix indentation issue

There is a statement that is incorrectly indented, fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/libertas_tf/main.c

@@ -676,7 +676,7 @@ int lbtf_remove_card(struct lbtf_private *priv)
 	ieee80211_unregister_hw(hw);
 	ieee80211_free_hw(hw);
 
-    lbtf_deb_leave(LBTF_DEB_MAIN);
+	lbtf_deb_leave(LBTF_DEB_MAIN);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(lbtf_remove_card);