usb: serial: dump small buffers with help of %*ph

There is a specifier we may use to dump small buffers.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 7151659..dc74c25 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -300,8 +300,7 @@
 	i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 			    GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 			    0, 0, buf, 7, 100);
-	dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x\n", i,
-	    buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
+	dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %7ph\n", i, buf);
 
 	if (cflag & CSIZE) {
 		switch (cflag & CSIZE) {
@@ -448,8 +447,7 @@
 	i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 			    GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 			    0, 0, buf, 7, 100);
-	dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x\n", i,
-	     buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
+	dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %7ph\n", i, buf);
 
 	if (cflag & CRTSCTS) {
 		if (spriv->type == HX)