Merge r1812307 from trunk: * server/util_expr_eval.c (ap_expr_eval_re_backref): Fix gcc 7.x warning. util_expr_eval.c: In function ‘ap_expr_eval_re_backref’: util_expr_eval.c:265:63: error: comparison between pointer and zero character constant [-Werror=pointer-compare] if (!ctx->re_pmatch || !ctx->re_source || *ctx->re_source == '\0' || Reviewed by: rjung, ylavic, jorton