Change debug message to "Port not open" when a closed port is used.
Fixes bug #710.
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@ -389,12 +389,12 @@ SP_API void sp_free_port_list(struct sp_port **list)
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#ifdef _WIN32
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#define CHECK_PORT_HANDLE() do { \
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if (port->hdl == INVALID_HANDLE_VALUE) \
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RETURN_ERROR(SP_ERR_ARG, "Invalid port handle"); \
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RETURN_ERROR(SP_ERR_ARG, "Port not open"); \
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} while (0)
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#else
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#define CHECK_PORT_HANDLE() do { \
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if (port->fd < 0) \
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RETURN_ERROR(SP_ERR_ARG, "Invalid port fd"); \
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RETURN_ERROR(SP_ERR_ARG, "Port not open"); \
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} while (0)
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#endif
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#define CHECK_OPEN_PORT() do { \
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