Correct test to use Unsigned version of function

Jan Breuer

2015-10-04 4133f2d8ba0d49c6d9a6a93650a81743aef81fa4

 libscpi/src/lexer_private.h

@@ -58,6 +58,7 @@
    int scpiLex_Semicolon(lex_state_t * state, scpi_token_t * token) LOCAL;
    int scpiLex_Colon(lex_state_t * state, scpi_token_t * token) LOCAL;
    int scpiLex_NewLine(lex_state_t * state, scpi_token_t * token) LOCAL;
    int scpiLex_SpecificCharacter(lex_state_t * state, scpi_token_t * token, char chr) LOCAL;

#ifdef   __cplusplus
}