MFC	r239359:

Remove unused member of struct indir (in_exists) from UFS and EXT2 code.

Discussed with:		mjg
MFC	r246347, r246348, r246349, r246350, r246351, r246352:

ext2fs: Miscellaneous cleanups and fixes.

Use EXT2_LINK_MAX instead of LINK_MAX.
Use nitems().
Correct off-by-one errors in FFTODT() and DDTOFT().
Remove useless rootino local variable.
Remove unused em_e2fsb definition.
Move assignment where it is not dead.

Submitted by:		Christoph Mallon
MFC r246507: sh: Fix a comment.
MFC r246371: sh: Do not test for digit_contig in mksyntax.

ISO/IEC 9899:1999 (E) 5.2.1p3 guarantees that the values of the characters
0123456789 are contiguous.

The generated syntax.c and syntax.h remain the same.

Submitted by:	Christoph Mallon