2.0.5a smbmount returns 0 on failure!

[Keith G. Murphy]

The smbmount that comes with samba 2.0.5a apparently returns 0 on
failure.

This happens on my Debian system either using smbmount (which apparently
is a wrapper that invokes smbmount-2.2.x) or smbmount-2.2.x itself.

Makes it kind of hard to check for failure in a script!  :-\

Also, the documentation doesn't cover how to specify a password in the
new smbmount, since -P went out of style.

The correct way is '-U username%password'.  Note that for share-level
security, where you don't have a username, '-U %password' works fine.