drm/amdgpu: remove set but not used variable 'header'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c: In function 'amdgpu_ucode_init_bo':
drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c:431:39: warning:
 variable 'header' set but not used [-Wunused-but-set-variable]

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -451,7 +451,6 @@ int amdgpu_ucode_init_bo(struct amdgpu_device *adev)
 	uint64_t fw_offset = 0;
 	int i;
 	struct amdgpu_firmware_info *ucode = NULL;
-	const struct common_firmware_header *header = NULL;
 
  /* for baremetal, the ucode is allocated in gtt, so don't need to fill the bo when reset/suspend */
 	if (!amdgpu_sriov_vf(adev) && (adev->in_gpu_reset || adev->in_suspend))
@@ -472,7 +471,6 @@ int amdgpu_ucode_init_bo(struct amdgpu_device *adev)
 	for (i = 0; i < adev->firmware.max_ucodes; i++) {
 		ucode = &adev->firmware.ucode[i];
 		if (ucode->fw) {
-			header = (const struct common_firmware_header *)ucode->fw->data;
 			amdgpu_ucode_init_single_fw(adev, ucode, adev->firmware.fw_buf_mc + fw_offset,
 						    adev->firmware.fw_buf_ptr + fw_offset);
 			if (i == AMDGPU_UCODE_ID_CP_MEC1 &&