Fix findCommand const parameter (pull-request #17)

Jan Breuer

2014-12-12 182d9a4b6937744aefb4c0a315226c1ad5568d68

 libscpi/inc/scpi/types.h

@@ -111,12 +111,19 @@
        char * data;
    };
    typedef struct _scpi_buffer_t scpi_buffer_t;
    
    struct _scpi_const_buffer_t {
        size_t length;
        size_t position;
        const char * data;
    };
    typedef struct _scpi_const_buffer_t scpi_const_buffer_t;    

    struct _scpi_param_list_t {
        const scpi_command_t * cmd;
        const char * parameters;
        size_t length;
        scpi_buffer_t cmd_raw;
        scpi_const_buffer_t cmd_raw;
    };
    #define SCPI_CMD_LIST_END       {NULL, NULL, }
    typedef struct _scpi_param_list_t scpi_param_list_t;