Fixes for some compiler warnings.

sql/mdl.cc

@@ -3030,7 +3030,7 @@ void MDL_ticket::wsrep_report(bool debug)
 {
   if (debug) 
     {
-      WSREP_DEBUG("MDL ticket: type: %s space: %s db: %s name: %s",
+      WSREP_DEBUG("MDL ticket: type: %s space: %s db: %s name: %s (%s)",
        	 (get_type()  == MDL_INTENTION_EXCLUSIVE)  ? "intention exclusive"  :
        	 ((get_type() == MDL_SHARED)               ? "shared"               :
        	 ((get_type() == MDL_SHARED_HIGH_PRIO      ? "shared high prio"     :

sql/wsrep_applier.cc

@@ -100,7 +100,7 @@ static wsrep_cb_status_t wsrep_apply_events(THD*        thd,
 
     if (!ev)
     {
-      WSREP_ERROR("applier could not read binlog event, seqno: %lld, len: %ld",
+      WSREP_ERROR("applier could not read binlog event, seqno: %lld, len: %zu",
                   (long long)wsrep_thd_trx_seqno(thd), buf_len);
       rcode= 1;
       goto error;