[Bug 6228] SMBC_open_ctx failure due to path resolve failure doesn't set errno

[Bug 6228] SMBC_open_ctx failure due to path resolve failure doesn't set errno

Fixed.

It turns out there were a number of places where cli_resolve_path() was called
and the error path upon that function failing did not set errno. There were a
couple of places the failure handling code did set errno to ENOENT, so I made
them all consistent, although I think better errno choices for this condition
exist, e.g.  EHOSTUNREACH.

Derrell