ptp: Fix possible memory leak in ptp_clock_register()

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

ptp: Fix possible memory leak in ptp_clock_register()

I got memory leak as follows when doing fault injection test:

unreferenced object 0xffff88800906c618 (size 8):

comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (age 13.188s)

hex dump (first 8 bytes):

70 74 70 30 00 00 00 00 ptp0....

backtrace:

[<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0

[<0000000079f6e2ff>] kvasprintf+0xb5/0x150

[<0000000026aae54f>] kvasprintf_const+0x60/0x190

[<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150

[<000000004e35abdd>] dev_set_name+0xc0/0x100

[<00000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp]

[<000000008bb9f0de>] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33]

When posix_clock_register() returns an error, the name allocated

in dev_set_name() will be leaked, the put_device() should be used

to give up the device reference, then the name will be freed in

kobject_cleanup() and other memory will be freed in ptp_clock_release().