stefanberger / swtpm / 3904

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swtpm: Avoid locking directory multiple times

Commit 2d3deaef29 forgot to move the check for whether the lock file has
already been opened into the new function opening the lock file and there-
fore the lock file is now opened whenever swtpm gets a PTM_INIT. This fix
prevents the reopening of the lockfile if it has already been opened.
Otherwise many PTM_INIT's will lead to failure since no more files can
be opened.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

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