Fixed the reuse of parsed DTDs and XSLTs.

Patch by Kuramoto Eiji.
diff --git a/src/http/modules/ngx_http_xslt_filter_module.c b/src/http/modules/ngx_http_xslt_filter_module.c
index 4309a44..9b0354b 100644
--- a/src/http/modules/ngx_http_xslt_filter_module.c
+++ b/src/http/modules/ngx_http_xslt_filter_module.c
@@ -810,7 +810,7 @@
 
     file = xmcf->dtd_files.elts;
     for (i = 0; i < xmcf->dtd_files.nelts; i++) {
-        if (ngx_strcmp(file[i].name, &value[1].data) == 0) {
+        if (ngx_strcmp(file[i].name, value[1].data) == 0) {
             xlcf->dtd = file[i].data;
             return NGX_CONF_OK;
         }
@@ -884,7 +884,7 @@
 
     file = xmcf->sheet_files.elts;
     for (i = 0; i < xmcf->sheet_files.nelts; i++) {
-        if (ngx_strcmp(file[i].name, &value[1].data) == 0) {
+        if (ngx_strcmp(file[i].name, value[1].data) == 0) {
             sheet->stylesheet = file[i].data;
             goto found;
         }