drm/amdgpu: remove useless BUG_ONs

Dereferencing NULL pointers will cause a BUG anyway. No need to do
an explicit check.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

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

@@ -212,10 +212,6 @@ int alloc_gtt_mem(struct kgd_dev *kgd, size_t size,
 	struct kgd_mem **mem = (struct kgd_mem **) mem_obj;
 	int r;
 
-	BUG_ON(kgd == NULL);
-	BUG_ON(gpu_addr == NULL);
-	BUG_ON(cpu_ptr == NULL);
-
 	*mem = kmalloc(sizeof(struct kgd_mem), GFP_KERNEL);
 	if ((*mem) == NULL)
 		return -ENOMEM;
@@ -269,8 +265,6 @@ void free_gtt_mem(struct kgd_dev *kgd, void *mem_obj)
 {
 	struct kgd_mem *mem = (struct kgd_mem *) mem_obj;
 
-	BUG_ON(mem == NULL);
-
 	amdgpu_bo_reserve(mem->bo, true);
 	amdgpu_bo_kunmap(mem->bo);
 	amdgpu_bo_unpin(mem->bo);

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c

@@ -812,8 +812,6 @@ static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type)
 	struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
 	const union amdgpu_firmware_header *hdr;
 
-	BUG_ON(kgd == NULL);
-
 	switch (type) {
 	case KGD_ENGINE_PFP:
 		hdr = (const union amdgpu_firmware_header *)

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c

@@ -775,8 +775,6 @@ static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type)
 	struct amdgpu_device *adev = (struct amdgpu_device *) kgd;
 	const union amdgpu_firmware_header *hdr;
 
-	BUG_ON(kgd == NULL);
-
 	switch (type) {
 	case KGD_ENGINE_PFP:
 		hdr = (const union amdgpu_firmware_header *)