[PATCH] Fix smbd crash when printing lease record.

[Jeremy Allison]

This is the fix for the crash reproduced by doing:

make -j test TESTS="samba3.smbtorture_s3.crypt_client" SMBD_OPTIONS=-d11 WINBINDD_OPTIONS=-d11

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12793

Inside struct share_mode_entry there is a pointer to
a struct share_mode_lease. This pointer is fixed
up by hand to point to an entry in the leases[]
array in the containing struct share_mode_data,
with an offset of share_mode_entry->lease_idx.

If the share_mode_entry isn't pointing to a
valid lease, then share_mode_entry->lease_idx is
set to 0xFFFFFFFF and share_mode_entry->lease
is an invalid pointer, but the ndr printing
code still tries to print it out in a debug
when the debug level is set high enough.

Patch passes full make test. Please review
and push if happy.

Cheers,

	Jeremy.
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