Defect in XSH pthread_barrierattr_destroy

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        Defect report from : Loic Domaigne , Personal Interest

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@ page 1016 line 32061 section pthread_barrierattr_destroy comment 
{pthread_barrierattr_init, issue EBUSY}

Problem:

Edition of Specification (Year): 2003

Defect code :  2. Omission

References are given against TC1.

In lines 32053-32054, it is said that:

| results are undefined if pthread_barrierattr_init() is called
| specifying an already initialized attr attributes object. 

However, the standard doesn't define any optional checking for this error.

Action:

At l32061-32066 (§ERRORS), add:

The pthread_barrierattr_init() may fail if:

[EBUSY]
The implementation has detected an attempt to reinitialize the barrier 
attribute object referenced by attr, a previously initialized, but not 
yet destroyed, attribute object.