- Compute the correct size to reallocate when doubling the size of the
  array of loaded objects to avoid a buffer overrun.
- Use reallocf() to avoid leaking memory if the realloc() fails.

PR:		kern/175648
Submitted by:	yuri@rawbw.com (1)
MFC after:	1 week
Mark 'ticks', 'time_second', and 'time_uptime' as volatile to prevent the
compiler from caching their values in tight loops.

Reviewed by:	bde
MFC after:	1 week
Merge two bug fixes from the vendor branch.

Reported by:	pjd
Fix white spaces for style consistency.
Fix two misusages of return_*() macros for ACPICA.

Noticed by:	avg