K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2012-06-13T17:12:53.163459Z
K 7
svn:log
V 596
Re-apply reverted parts of r236935 by pjd with some changes.

If fdalloc() decides to grow fdtable it does it once and at most doubles
the size. This still may be not enough for sufficiently large fd. Use fd
in calculations of new size in order to fix this.

When growing the table, fd is already equal to first free descriptor >= minfd,
also fdgrowtable() no longer drops the filedesc lock. As a result of this there
is no need to retry allocation nor lookup.

Fix description of fd_first_free to note all return values.

In co-operation with:	pjd
Approved by:	trasz (mentor)
MFC after:	1 month

END