is_acnet_error_c

	status.i4.v = is_acnet_error_c(value.i4.v)

	This routine tests a value to see if it's a valid ACNET error
	code.  It checks to see if the low order byte of the value is
	a valid ACNET error facility number and if the next byte is a
	valid error number.

	value		value to test

	This function returns status values as follows:

	TRUE			passed value is a valid ACNET error code
	FALSE			passed value is not a valid ACNET error code

	This function requires the following include files:

	clib_h

	Related functions:

	acnet_error_text, acnet_error_code, fac_name_to_code,
	fac_code_to_name_c, ierrtx, acnet_error_description_c
	error_in_list(_c), acnet_error_category

	C/C++ usage:

	int	status;
	int	value = DPM_PEND;

	status = is_acnet_error_c(value);