CVE-2023-53453

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

drm/radeon: free iio for atombios when driver shutdown

Fix below kmemleak when unload radeon driver:

unreferenced object 0xffff9f8608ede200 (size 512): comm "systemd-udevd", pid 326, jiffies 4294682822 (age 716.338s) hex dump (first 32 bytes): 00 00 00 00 c4 aa ec aa 14 ab 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<0000000062fadebe>] kmemcachealloctrace+0x2f1/0x500 [<00000000b6883cea>] atomparse+0x117/0x230 [radeon] [<00000000158c23fd>] radeonatombiosinit+0xab/0x170 [radeon] [<00000000683f672e>] siinit+0x57/0x750 [radeon] [<00000000566cc31f>] radeondeviceinit+0x559/0x9c0 [radeon] [<0000000046efabb3>] radeondriverloadkms+0xc1/0x1a0 [radeon] [<00000000b5155064>] drmdevregister+0xdd/0x1d0 [<0000000045fec835>] radeonpciprobe+0xbd/0x100 [radeon] [<00000000e69ecca3>] pcideviceprobe+0xe1/0x160 [<0000000019484b76>] really_probe.part.0+0xc1/0x2c0 [<000000003f2649da>] __driverprobedevice+0x96/0x130 [<00000000231c5bb1>] driverprobedevice+0x24/0xf0 [<0000000000a42377>] _driverattach+0x77/0x190 [<00000000d7574da6>] busforeachdev+0x7f/0xd0 [<00000000633166d2>] driverattach+0x1e/0x30 [<00000000313b05b8>] busadddriver+0x12c/0x1e0

iio was allocated in atomindexiio() called by atomparse(), but it doesn't got released when the dirver is shutdown. Fix this kmemleak by free it in radeonatombios_fini().