[POWERPC] Assign correct variable in hpte_decode()

This case will never be hit, but it should be corrected anyway.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_native_64.c

@@ -395,7 +395,7 @@ static void hpte_decode(hpte_t *hpte, unsigned long slot,
 			vpi = (vsid ^ (vsid << 25) ^ pteg) & htab_hash_mask;
 			break;
 		default:
-			avpn = vpi = psize = 0;
+			avpn = vpi = size = 0;
 		}
 		avpn |= (vpi << mmu_psize_defs[size].shift);
 	}