cputlb: Fix tlb_vaddr_to_host

Using uintptr_t instead of target_ulong meant that, for 64-bit guest
and 32-bit host, we truncated the guest address comparator and so may
not hit the tlb when we should.

Fixes: 4811e9095c
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/cputlb.c

@@ -1189,7 +1189,7 @@ void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr,
                         MMUAccessType access_type, int mmu_idx)
 {
     CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
-    uintptr_t tlb_addr, page;
+    target_ulong tlb_addr, page;
     size_t elt_ofs;
 
     switch (access_type) {