[Openais] fix stack protector abort in coroipcs/coroipcc

[Steven Dake]

Corosync uses snprintf to verify that a string is not too long in 
Angus's recent patch.  The string being passed into the buffer was not 
long enough, resulting in a stack protector sigabort when corosync is 
compiled with stack protection.

Patch attached to fix

Regards
-steve
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