drm/amdgpu: fix a few compiler warnings

1. make function mmhub_v1_7_setup_vm_pt_regs static
2. indent a if statement
Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c

@@ -53,7 +53,7 @@ static u64 mmhub_v1_7_get_fb_location(struct amdgpu_device *adev)
 	return base;
 }
 
-void mmhub_v1_7_setup_vm_pt_regs(struct amdgpu_device *adev, uint32_t vmid,
+static void mmhub_v1_7_setup_vm_pt_regs(struct amdgpu_device *adev, uint32_t vmid,
 				uint64_t page_table_base)
 {
 	struct amdgpu_vmhub *hub = &adev->vmhub[AMDGPU_MMHUB_0];