Bluetooth: hci_codec: Fix leaking content of local_codecs

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

Bluetooth: hci_codec: Fix leaking content of local_codecs

The following memory leak can be observed when the controller supports

codecs which are stored in local_codecs list but the elements are never

freed:

unreferenced object 0xffff88800221d840 (size 32):

comm "kworker/u3:0", pid 36, jiffies 4294898739 (age 127.060s)

hex dump (first 32 bytes):

f8 d3 02 03 80 88 ff ff 80 d8 21 02 80 88 ff ff ..........!.....

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace:

[<ffffffffb324f557>] __kmalloc+0x47/0x120

[<ffffffffb39ef37d>] hci_codec_list_add.isra.0+0x2d/0x160

[<ffffffffb39ef643>] hci_read_codec_capabilities+0x183/0x270

[<ffffffffb39ef9ab>] hci_read_supported_codecs+0x1bb/0x2d0

[<ffffffffb39f162e>] hci_read_local_codecs_sync+0x3e/0x60

[<ffffffffb39ff1b3>] hci_dev_open_sync+0x943/0x11e0

[<ffffffffb396d55d>] hci_power_on+0x10d/0x3f0

[<ffffffffb30c99b4>] process_one_work+0x404/0x800

[<ffffffffb30ca134>] worker_thread+0x374/0x670

[<ffffffffb30d9108>] kthread+0x188/0x1c0

[<ffffffffb304db6b>] ret_from_fork+0x2b/0x50

[<ffffffffb300206a>] ret_from_fork_asm+0x1a/0x30