drm/amdgpu: cleanup coding style in amdgpu_amdkfd_gpuvm.c

Fix everything checkpatch.pl complained about in amdgpu_amdkfd_gpuvm.c

Reviewed-by: Felix Kuehling <[e-mail]>
Signed-off-by: Jingyu Wang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

···
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2014-2018 Advanced Micro Devices, Inc.
  *
···
 	uint64_t reserved_for_pt =
 		ESTIMATE_PT_SIZE(amdgpu_amdkfd_total_mem_size);
 	size_t available;
+
 	spin_lock(&kfd_mem_limit.mem_limit_lock);
 	available = adev->gmc.real_vram_size
 		- adev->kfd.vram_used_aligned
···
 {
 	if (atomic_read(&adev->gmc.vm_fault_info_updated) == 1) {
 		*mem = *adev->gmc.vm_fault_info;
-		mb();
+		mb(); /* make sure read happened */
 		atomic_set(&adev->gmc.vm_fault_info_updated, 0);
 	}
 	return 0;