USB: Fix a memory leak in em28xx_usb_probe()

If, in em28xx_usb_probe() the memory allocation
	dev->alt_max_pkt_size = kmalloc(32*
						dev->num_alt,GFP_KERNEL);
fails, then we'll bail out and return -ENOMEM.
The problem is that in that case we don't free the storage allocated
to 'dev', thus causing a memory leak.

This patch fixes the leak by freeing 'dev' before we return -ENOMEM.
This fixes Coverity bug #647.
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/media/video/em28xx/em28xx-video.c

@@ -1772,6 +1772,7 @@ static int em28xx_usb_probe(struct usb_interface *interface,
 	if (dev->alt_max_pkt_size == NULL) {
 		em28xx_errdev("out of memory!\n");
 		em28xx_devused&=~(1<<nr);
+		kfree(dev);
 		return -ENOMEM;
 	}