media: ov2740: Fix memleak in ov2740_init_controls()

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

media: ov2740: Fix memleak in ov2740_init_controls()

There is a kmemleak when testing the media/i2c/ov2740.c with bpf mock

device:

unreferenced object 0xffff8881090e19e0 (size 16):

comm "51-i2c-ov2740", pid 278, jiffies 4294781584 (age 23.613s)

hex dump (first 16 bytes):

00 f3 7c 0b 81 88 ff ff 80 75 6a 09 81 88 ff ff ..|......uj.....

backtrace:

[<000000004e9fad8f>] __kmalloc_node+0x44/0x1b0

[<0000000039c802f4>] kvmalloc_node+0x34/0x180

[<000000009b8b5c63>] v4l2_ctrl_handler_init_class+0x11d/0x180

[videodev]

[<0000000038644056>] ov2740_probe+0x37d/0x84f [ov2740]

[<0000000092489f59>] i2c_device_probe+0x28d/0x680

[<000000001038babe>] really_probe+0x17c/0x3f0

[<0000000098c7af1c>] __driver_probe_device+0xe3/0x170

[<00000000e1b3dc24>] device_driver_attach+0x34/0x80

[<000000005a04a34d>] bind_store+0x10b/0x1a0

[<00000000ce25d4f2>] drv_attr_store+0x49/0x70

[<000000007d9f4e9a>] sysfs_kf_write+0x8c/0xb0

[<00000000be6cff0f>] kernfs_fop_write_iter+0x216/0x2e0

[<0000000031ddb40a>] vfs_write+0x658/0x810

[<0000000041beecdd>] ksys_write+0xd6/0x1b0

[<0000000023755840>] do_syscall_64+0x38/0x90

[<00000000b2cc2da2>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

ov2740_init_controls() won't clean all the allocated resources in fail

path, which may causes the memleaks. Add v4l2_ctrl_handler_free() to

prevent memleak.