drm/amdgpu: Fix sdma v4 sw fini error

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

drm/amdgpu: Fix sdma v4 sw fini error

Fix sdma v4 sw fini error for sdma 4.2.2 to

solve the following general protection fault

[ +0.108196] general protection fault, probably for non-canonical

address 0xd5e5a4ae79d24a32: 0000 [#1] PREEMPT SMP PTI

[ +0.000018] RIP: 0010:free_fw_priv+0xd/0x70

[ +0.000022] Call Trace:

[ +0.000012] <TASK>

[ +0.000011] release_firmware+0x55/0x80

[ +0.000021] amdgpu_ucode_release+0x11/0x20 [amdgpu]

[ +0.000415] amdgpu_sdma_destroy_inst_ctx+0x4f/0x90 [amdgpu]

[ +0.000360] sdma_v4_0_sw_fini+0xce/0x110 [amdgpu]