Coverity: fix allocation size as reported in new code

src/lib/ares__iface_ips.c

@@ -201,8 +201,9 @@ static ares_status_t
     size_t alloc_size;
 
     alloc_size = ares__round_up_pow2(ips->alloc_size + 1);
-    temp       = ares_realloc_zero(ips->ips, ips->alloc_size * sizeof(ips->ips),
-                                   alloc_size * sizeof(ips->ips));
+    temp       = ares_realloc_zero(ips->ips,
+                                   ips->alloc_size * sizeof(*ips->ips),
+                                   alloc_size * sizeof(*ips->ips));
     if (temp == NULL) {
       return ARES_ENOMEM;
     }