Inconsistent initialization of the label part in PointXYZL and PointXYZRGBL

[csukuangfj]

Your Environment

• PCL Version: the master branch

Context

See the code

pcl/common/include/pcl/impl/point_types.hpp

Lines 504 to 509 in 9467b94

	inline PointXYZL ()
	{
	x = y = z = 0.0f;
	data[3] = 1.0f;
	label = 0;
	}

pcl/common/include/pcl/impl/point_types.hpp

Lines 659 to 666 in 9467b94

	inline PointXYZRGBL ()
	{
	x = y = z = 0.0f;
	data[3] = 1.0f;
	r = g = b = 0;
	a = 255;
	label = 255;
	}

pcl/common/include/pcl/impl/point_types.hpp

Lines 1034 to 1041 in 9467b94

	inline PointXYZLNormal ()
	{
	x = y = z = 0.0f;
	data[3] = 1.0f;
	normal_x = normal_y = normal_z = data_n[3] = 0.0f;
	label = 0;
	curvature = 0;
	}

Expected Behavior

label should be initialized to the same value across different types.

Current Behavior

It is 0 in PointXYZL and PointXYZLNormal but 255 in PointXYZRGBL.

Code to Reproduce

See the code above.

Possible Solution

Change it to 0 for PointXYZRGBL since 255 does not make sense.