HID: amd_sfh: Fix memory leak in amd_sfh_work

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

HID: amd_sfh: Fix memory leak in amd_sfh_work

Kmemleak tool detected a memory leak in the amd_sfh driver.

====================

unreferenced object 0xffff88810228ada0 (size 32):

comm "insmod", pid 3968, jiffies 4295056001 (age 775.792s)

hex dump (first 32 bytes):

00 20 73 1f 81 88 ff ff 00 01 00 00 00 00 ad de . s.............

22 01 00 00 00 00 ad de 01 00 02 00 00 00 00 00 "...............

backtrace:

[<000000007b4c8799>] kmem_cache_alloc_trace+0x163/0x4f0

[<0000000005326893>] amd_sfh_get_report+0xa4/0x1d0 [amd_sfh]

[<000000002a9e5ec4>] amdtp_hid_request+0x62/0x80 [amd_sfh]

[<00000000b8a95807>] sensor_hub_get_feature+0x145/0x270 [hid_sensor_hub]

[<00000000fda054ee>] hid_sensor_parse_common_attributes+0x215/0x460 [hid_sensor_iio_common]

[<0000000021279ecf>] hid_accel_3d_probe+0xff/0x4a0 [hid_sensor_accel_3d]

[<00000000915760ce>] platform_probe+0x6a/0xd0

[<0000000060258a1f>] really_probe+0x192/0x620

[<00000000fa812f2d>] driver_probe_device+0x14a/0x1d0

[<000000005e79f7fd>] __device_attach_driver+0xbd/0x110

[<0000000070d15018>] bus_for_each_drv+0xfd/0x160

[<0000000013a3c312>] __device_attach+0x18b/0x220

[<000000008c7b4afc>] device_initial_probe+0x13/0x20

[<00000000e6e99665>] bus_probe_device+0xfe/0x120

[<00000000833fa90b>] device_add+0x6a6/0xe00

[<00000000fa901078>] platform_device_add+0x180/0x380

====================

The fix is to freeing request_list entry once the processed entry is

removed from the request_list.