Fix Matthews code to actually use tmp

Matthew's autoaddr code returned an undecorated address when trying to check
that the code didn't insert an undecorated one into the map.

This patch fixes this by actually storing the undecorated address in tmp
instead of buf as it was originally intended.

This patch is released under the same license as the original file as
long as the author iscredited.

Signed-off-by: Francisco Blas Izquierdo Riera (klondike) <klondike@gentoo.org>

src/or/addressmap.c

@@ -888,7 +888,7 @@ addressmap_get_virtual_address(int type)
         /* XXXX This code is to make sure I didn't add an undecorated version
          * by mistake. I hope it's needless. */
         char tmp[TOR_ADDR_BUF_LEN];
-        tor_addr_to_str(buf, &addr, sizeof(tmp), 0);
+        tor_addr_to_str(tmp, &addr, sizeof(tmp), 0);
         if (strmap_get(addressmap, tmp)) {
           log_warn(LD_BUG, "%s wasn't in the addressmap, but %s was.",
                    buf, tmp);