K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-01-04T20:07:11.338819Z
K 7
svn:log
V 472
ssp: knock out some trivial warnings that come up with WARNS=6

A future commit will rebuild this as part of libssp. The exact warnings are
fairly trivially fixed:
- No previous declaration for __stack_chk_guard
- idx is the wrong type, nitems yields a size_t
- Casting away volatile on the tmp_stack_chk_guard directly is a no-no.

Reviewed by:	kib, emaste, pfg, Oliver Pinter (earlier version)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D22943

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