drm/amdgpu: fix overflow on 32bit systems

mem->start is a long, so this can overflow on 32bit systems.

Signed-off-by: Christian König <[e-mail]>
Reviewed-by: Jammy Zhou <[e-mail]>
Cc: [e-mail]

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

···
 	int r;
 
 	if (mem) {
-		addr = mem->start << PAGE_SHIFT;
+		addr = (u64)mem->start << PAGE_SHIFT;
 		if (mem->mem_type != TTM_PL_TT)
 			addr += adev->vm_manager.vram_base_offset;
 	} else {