fix compile error

include/stellar/log.h

@@ -52,8 +52,6 @@ enum log_level
     }
 
 struct logger;
-struct logger *stellar_get_logger(struct stellar *st);
-
 int log_check_level(struct logger *logger, enum log_level level);
 void log_print(struct logger *logger, enum log_level level, const char *module, const char *fmt, ...);