Resolve #58: Illegal parameter value and unit test

Jan Breuer

2015-10-14 b7e9d6858699f5ea9a23ecf6587e98e7b0e1bc28

 libscpi/src/units.c

@@ -283,7 +283,7 @@
            scpiLex_CharacterProgramData(&state, &token);

            /* convert string to special number type */
            SCPI_ParamToChoice(context, &token, special, &tag);
            result = SCPI_ParamToChoice(context, &token, special, &tag);

            value->special = TRUE;
            value->tag = tag;