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doc: zmq_msg_init does not set errno
In fact it always returns zero.
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@ -28,8 +28,7 @@ _zmq_msg_init_size()_ are mutually exclusive. Never initialise the same
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RETURN VALUE
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RETURN VALUE
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------------
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------------
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The _zmq_msg_init()_ function shall return zero if successful. Otherwise it
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The _zmq_msg_init()_ function always returns zero.
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shall return `-1` and set 'errno' to one of the values defined below.
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ERRORS
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ERRORS
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