japi: fix compilation on 32-bit systems

Change-Id: Ia7cb986544a13cc17b43b2f0948482deb02e8fb5
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vpp-api/java/jvpp-ioampot/jvpp_ioam_pot.c b/src/vpp-api/java/jvpp-ioampot/jvpp_ioam_pot.c
index 5f28344..8f39698 100644
--- a/src/vpp-api/java/jvpp-ioampot/jvpp_ioam_pot.c
+++ b/src/vpp-api/java/jvpp-ioampot/jvpp_ioam_pot.c
@@ -47,7 +47,7 @@
   clib_warning ("Java_io_fd_vpp_jvpp_ioampot_JVppIoampotImpl_init0");
 
   plugin_main->my_client_index = my_client_index;
-  plugin_main->vl_input_queue = (unix_shared_memory_queue_t *)queue_address;
+  plugin_main->vl_input_queue = uword_to_pointer (queue_address, unix_shared_memory_queue_t *);
 
   plugin_main->callbackObject = (*env)->NewGlobalRef(env, callback);
   plugin_main->callbackClass = (jclass)(*env)->NewGlobalRef(env, (*env)->GetObjectClass(env, callback));