Removed call to delete_head_blocking that was removed from new gnu radio
diff --git a/lib/misc_utils/extract_system_info_impl.cc b/lib/misc_utils/extract_system_info_impl.cc
index 6338368..bb7fada 100644
--- a/lib/misc_utils/extract_system_info_impl.cc
+++ b/lib/misc_utils/extract_system_info_impl.cc
@@ -269,10 +269,10 @@
     {
         d_c0_channels.clear();
         if(!empty_p(pmt::mp("bursts"))){
-            delete_head_blocking(pmt::mp("bursts"));
+//            delete_head_blocking(pmt::mp("bursts"));
         }
         if(!empty_p(pmt::mp("msgs"))){
-            delete_head_blocking(pmt::mp("msgs"));
+//            delete_head_blocking(pmt::mp("msgs"));
         }
     }