USB: serial: io_ti: remove some remaining printk() calls

Use dev_err() like the rest of that function does, and the rest of the
driver does, to properly show what device and driver caused the problem.

Cc: Johan Hovold <jhovold@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/io_ti.c

@@ -845,7 +845,7 @@ static int build_i2c_fw_hdr(__u8 *header, struct device *dev)
 
 	err = request_firmware(&fw, fw_name, dev);
 	if (err) {
-		printk(KERN_ERR "Failed to load image \"%s\" err %d\n",
+		dev_err(dev, "Failed to load image \"%s\" err %d\n",
 			fw_name, err);
 		kfree(buffer);
 		return err;
@@ -1404,7 +1404,7 @@ static int download_fw(struct edgeport_serial *serial)
 
 		err = request_firmware(&fw, fw_name, dev);
 		if (err) {
-			printk(KERN_ERR "Failed to load image \"%s\" err %d\n",
+			dev_err(dev, "Failed to load image \"%s\" err %d\n",
 				fw_name, err);
 			kfree(buffer);
 			return err;