[PATCH] Fix bug #10431 - STATUS_NO_MEMORY response from Query File Posix Lock request

[Jeremy Allison]

Hi Volker & Jeff,

Here's a fix for master:

brl_get_locks_readonly() currently returns NULL when it can't
find any byte range locks on the file. This is an error - it
should return a valid struct byte_range_lock containing num_locks == 0
so it can be cached.

Returning NULL when there are no locks causes POSIX lock
tests to fail returning NT_STATUS_NO_MEMORY (as it thinks
it can't allocate the struct) instead of NT_STATUS_OK.

Please review - it fixes the POSIX lock tester Jeff
is using.

Cheers,

Jeremy.
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