[patch]serqt_usb2: fix memory leak in error case

[Oliver Neukum <oliver@xxxxxxxxxx>]

Hi,

a standard memory leak, as later allocations may fail even if prior
allocations did not. Then the prior allocations must be undone.

	Regards
		Oliver

Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>

--

commit cd2052eef79511ac2d05efec7d0af44549c38a00
Author: Oliver Neukum <oliver@xxxxxxxxxx>
Date:   Thu Jul 9 23:53:05 2009 +0200

    staging: serqt_usb2: mem leak in error case

diff --git a/drivers/staging/serqt_usb2/serqt_usb2.c b/drivers/staging/serqt_usb2/serqt_usb2.c
index 90b29b5..e5c5785 100644
--- a/drivers/staging/serqt_usb2/serqt_usb2.c
+++ b/drivers/staging/serqt_usb2/serqt_usb2.c
@@ -736,6 +736,11 @@ static int qt_startup(struct usb_serial *serial)
 		if (!qt_port) {
 			dbg("%s: kmalloc for quatech_port (%d) failed!.",
 			    __func__, i);
+			for(--i; i >= 0; i--) {
+				port = serial->port[i];
+				kfree(usb_get_serial_port_data(port));
+				usb_set_serial_port_data(port, NULL);
+			}
 			return -ENOMEM;
 		}
 		spin_lock_init(&qt_port->lock);

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