media: zr364xx: fix memory leak in zr364xx_start_readpipe

In the Linux kernel, the following vulnerability has been resolved:

media: zr364xx: fix memory leak in zr364xx_start_readpipe

syzbot reported memory leak in zr364xx driver.

The problem was in non-freed urb in case of

usb_submit_urb() fail.

backtrace:

[<ffffffff82baedf6>] kmalloc include/linux/slab.h:561 [inline]

[<ffffffff82baedf6>] usb_alloc_urb+0x66/0xe0 drivers/usb/core/urb.c:74

[<ffffffff82f7cce8>] zr364xx_start_readpipe+0x78/0x130 drivers/media/usb/zr364xx/zr364xx.c:1022

[<ffffffff84251dfc>] zr364xx_board_init drivers/media/usb/zr364xx/zr364xx.c:1383 [inline]

[<ffffffff84251dfc>] zr364xx_probe+0x6a3/0x851 drivers/media/usb/zr364xx/zr364xx.c:1516

[<ffffffff82bb6507>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396

[<ffffffff826018a9>] really_probe+0x159/0x500 drivers/base/dd.c:576