Fix memset calls in sofia-sip

These calls were zeroing only a pointer's worth of memory rather than
the actual size of the objects.

libs/sofia-sip/libsofia-sip-ua/msg/msg.c

@@ -242,8 +242,8 @@ msg_mclass_t const *msg_mclass(msg_t const *msg)
  */
 void msg_addr_zero(msg_t *msg)
 {
-  memset(&msg->m_addr, 0, sizeof(&msg->m_addr));
-  memset(&msg->m_addrinfo, 0, sizeof(&msg->m_addrinfo));
+  memset(&msg->m_addr, 0, sizeof(msg->m_addr));
+  memset(&msg->m_addrinfo, 0, sizeof(msg->m_addrinfo));
 
   msg->m_addrinfo.ai_addrlen = sizeof(msg->m_addr);
   msg->m_addrinfo.ai_addr = &msg->m_addr->su_sa;

libs/sofia-sip/libsofia-sip-ua/su/su_root.c

@@ -152,7 +152,7 @@ _su_task_r su_task_init(su_task_r task)
 {
   assert(task);
 
-  memset(task, 0, sizeof(task));
+  memset(task, 0, sizeof(su_task_r));
   return task;
 }