wlcore: fix spelling mistakes in wl1271_warning

trivial fix to spelling mistakes in wl1271_warning error message, change
iligal to invalid and opperation to operation.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ti/wlcore/debugfs.c

@@ -1249,7 +1249,7 @@ static ssize_t fw_logger_write(struct file *file,
 	}
 
 	if (wl->conf.fwlog.output == 0) {
-		wl1271_warning("iligal opperation - fw logger disabled by default, please change mode via wlconf");
+		wl1271_warning("invalid operation - fw logger disabled by default, please change mode via wlconf");
 		return -EINVAL;
 	}