It decreases stack consumption in one of ncpfs's paths from 3000 to 2200
bytes (and stack portion in ncpfs ioctl code from 1336 to 452 bytes).

- some code used large structure (with embeded 256 bytes for filename)
  while it never passed filename around.  Use something smaller in
  ncp_conn_logged_in.  Decrease 616 => 300.

- gcc-3.3 is very bad when it comes to parallel blocks in ioctl.  Split
  some branches from large switch to separate functions.  ncp_ioctl now
  uses 152 bytes of stack (instead of 720) and biggest child 64.
Signed-off-by: Petr Vandrovec <vandrove@vc.cvut.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>