* Whitespace.
Being able to access a path do not necessarily mean we have access
to a directory. So instead of doing this, we just call mkdir(2)
directly and test if the returned value is 0 or errno is EISDIR.

Reported by:	Coverity
CID:		1238925
MFC after:	1 week
Plug a file descriptor leak.

Reported by:	Coverity
CID:		1238916
MFC after:	1 week
Refactor the code a little bit to avoid NULL deference when
allocation was failed.

Reported by:	Coverity
CID:		1238915
MFC after:	1 week
Use strlcpy(). I don't believe these are real problems but it's better
to use a safe idiom.

Reported by:	Coverity
CID:		1238914
MFC after:	1 week
Use a char * as iterator over a bounded string.

MFC after:	1 week
The strtol(3) family of functions would set errno when it hits one.
Check errno and handle it as invalid input.

Obtained from:	HardenedBSD
Submitted by:	David CARLIER <devnexen@gmail.com>
MFC after:	2 weeks
Explicitly set errno to 0 before calling strto*.

Suggested by:	mjg
MFC after:	2 weeks
Revert r272122

The patch still needs to be more robust and it broke the
build on MIPS so revert it for now while all the issues
are fixed.

Reported by:	ache, davide
PR:		137307
Merge remote-tracking branch 'freebsd/master' into hardened/current/segvguard