drm/nv50: fix smatch warning in nv50_vram.c

nv50_vm_map(struct nouveau_vma *vma, struct nouveau_gpuobj *pgt,

	    struct nouveau_vram *mem, u32 pte, u32 cnt, u64 phys)

{

	u32 block, i;

	u32 block;

	int i;

	phys  = nv50_vm_addr(vma, pgt, phys, mem->memtype, 0);

	pte <<= 3;