When testing whether to enter the audit argument gathering code, rather than checking whether audit is enabled globally, instead check whether the current thread has an audit record.  This avoids entering the audit code to collect argument data if auditing is enabled but the current system call is not of interest to audit.
When testing whether to enter the audit argument gathering code, rather
than checking whether audit is enabled globally, instead check whether
the current thread has an audit record.  This avoids entering the audit
code to collect argument data if auditing is enabled but the current
system call is not of interest to audit.

MFC after:	1 week
Sponsored by:	Apple, Inc.

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