K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2007-12-24T13:47:16.000000Z
K 7
svn:log
V 602
Move the check for the snp device being already attached after the
fget() call, that is sleeping point, and possibly dropping Giant.

The snp_target == NULL implies the snp_tty == NULL. Remove the code
that is put under snp_target == NULL and snp_tty != NULL clause.

In snpclose(), do the snp_detach() before scheduling the snp device
destruction. Otherwise, after the return from snpclose(), the snp
device is already removed from the snp_list, but tty is still in
snooped state. Any attempt to do i/o on such tty cause panic because
ttytosnp() returns NULL.

Tested by:	Peter Holm
MFC after:	1 week

END