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Josh Hursey 2e1fbc4c75 Fix a copy problem when using a drained message that has a NULL buffer. This often happens when draining a Barrier message which are sometimes point-to-point messages with count=0 and a NULL buffer.
This fixes a bug that can happen when checkpointing while one process is in such a routine. Previously a warning was thrown.

This commit was SVN r21080.
2009-04-27 18:39:45 +00:00
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