Fixed handling of empty root.
Previously, a configuration with "root" set to an empty string tried test a character at clcf->root.data[-1]. Additional test added to make sure this won't happen. Reported by Markus Linnala, see http://mailman.nginx.org/pipermail/nginx-devel/2015-August/007210.html.
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@ -4489,7 +4489,9 @@ ngx_http_core_root(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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clcf->alias = alias ? clcf->name.len : 0;
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clcf->root = value[1];
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if (!alias && clcf->root.data[clcf->root.len - 1] == '/') {
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if (!alias && clcf->root.len > 0
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&& clcf->root.data[clcf->root.len - 1] == '/')
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{
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clcf->root.len--;
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}
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