Properly use v_data field. This magically worked (even if wrong) until
now because v_data is the first field of the structure, but it's not
something we should rely on.
- Trim an unused and bogus Makefile for mount_smbfs.
- Reconnect with some minor modifications, in particular now selsocket()
internals are adapted to use sbintime units after recent'ish calloutng
switch.
Correct the comment above _sleep() function which still mentions 'timo'
instead of 'sbintime_t'.

Reported by:	kan
Remove a spurious keg lock acquisition.