Bug 148881

	libdisk(3)'s Int_Open_Disk() function makes some bad assumptions
	about the syntax of the lines come from sysctl kern.geom.conftxt
	(passed in via sysinstall).

	Disks, slices, or partitions which have spaces in their label
	names -- such as FAT-formatted USB flash drives with spaces in
	their volume name, or anything glabel'd -- will cause libdisk
	to spit out an error similar to the below.  Use of dialog
	in sysinstall hides portions of the error string:

	Int_Open_Disk(da1): can't parse length 'V100W' in line 3 (r='V100W')

	In this situation, the disk da1 was a FAT32-formatted USB flash
	drive with a volume name of "HP V100W".  kern.geom.conftxt showed:

0 DISK da1 4009754624 512 hd 255 sc 63
1 PART da1s1 4009722368 512 i 1 o 32256 ty !12 xs MBR xt 12
2 LABEL msdosfs/HP V100W 4009722368 512 i 0 o 0

Fix: I've spent the past 6-7 hours going over the libdisk(3) code's
	parser, and determined that (probably) the easiest way to deal
	with this is to ignore LABEL lines altogether.  There is probably
	a cleaner way to deal with this, such as using libgeom(3) (which I
	did try but the API is severely lacking in documentation), but
	this is what I came up with.  This should be thoroughly analysed
	before being considered for commit.

	Also, I want to point out that the inline comment for "t"
	assignment doesn't appear to be correct (see above example, re: MBR).
	This makes me wonder if we have further parser problems in this
	library (maybe this could explain PR 140972)?
How-To-Repeat: 	glabel create "some label" /dev/da0s1a
	sysinstall