fill_dem过早跳出for循环

[kongdd]

即使是碰到了边界和NaN值，也应该检索完8向。
L228的跳出，是否是bug?

FastFlow/FastFlow.cpp

Lines 221 to 229 in 6136752

	if (!dem.is_InGrid(iRow, iCol) || dem.is_NoData(iRow, iCol))
	{
	tmpNode.col = col;
	tmpNode.row = row;
	tmpNode.spill = dem.asFloat(row, col);
	queue.push(tmpNode);
	setFlag(row * width + col, flagArray);
	break;
	}