*: use void * for printing pointers

On higher warning levels, compilers expect %p printf arguments to be
void *.  Since format string / argument warnings can be useful
otherwise, let's get rid of this noise by sprinkling casts to void *
over printf calls.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/ospfd/ospf_flood.c b/ospfd/ospf_flood.c
index d18314a..c0b3622 100644
--- a/ospfd/ospf_flood.c
+++ b/ospfd/ospf_flood.c
@@ -244,7 +244,7 @@
     zlog_debug ("LSA[Flooding]: start, NBR %s (%s), cur(%p), New-LSA[%s]",
                inet_ntoa (nbr->router_id),
                LOOKUP (ospf_nsm_state_msg, nbr->state),
-               current,
+               (void *)current,
                dump_lsa_key (new));
 
   lsa_ack_flag = 0;
@@ -584,7 +584,8 @@
            * for the link on which the LSA has received.
            */
           if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
-            zlog_debug ("Type-9 Opaque-LSA: lsa->oi(%p) != oi(%p)", lsa->oi, oi);
+            zlog_debug ("Type-9 Opaque-LSA: lsa->oi(%p) != oi(%p)",
+                        (void *)lsa->oi, (void *)oi);
           continue;
         }
 #endif /* HAVE_OPAQUE_LSA */