interp_o_word.cc: Insert almost-certainly-missing "breaks"

addresses LinuxCNC#3290

Author: andypugh

src/emc/rs274ngc/interp_o_word.cc

@@ -430,6 +430,7 @@ int Interp::execute_return(setup_pointer settings, context_pointer current_frame
 		    settings->call_state = CS_REEXEC_EPILOG;
 		    eblock->call_type = CT_REMAP;
 		    CHP(status);
+		    break;
 		default:
 		    settings->call_state = CS_NORMAL;
 		    settings->sequence_number = previous_frame->sequence_number;
@@ -647,7 +648,7 @@ int Interp::handler_returned( setup_pointer settings,  context_pointer active_fr
 	    settings->value_returned = 1;
 	} else 
 	    return active_frame->pystuff.impl->py_returned_int;
-
+	break;
     case RET_ERRORMSG:
 	status = INTERP_ERROR;
 	break;