o nfs_vinvalbuf() is always called with the intrflag as 1, and then

o nfs_vinvalbuf() is always called with the intrflag as 1, and then
  checks if the mount is actually interrutable, and if not sets it 0.
  remove this argument from nfs_vinvalbuf and just do the checking inside
  the function.
o give nfs_vinvalbuf() a makeover so it looks nice. (spacing, casts, &c);
o Actually pass PCATCH too tsleep() if the mount it interrutable.

ok art@, blambert@