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 <Felix.Kuehling@amd.com>
Signed-off-by: Jingyu Wang <jingyuwang_vip@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2014-2018 Advanced Micro Devices, Inc.
  *
@@ -1612,6 +1613,7 @@ size_t amdgpu_amdkfd_get_available_memory(struct amdgpu_device *adev)
 	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
@@ -2216,7 +2218,7 @@ int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct amdgpu_device *adev,
 {
 	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;