John Kroll provided a small fix to xmlNanoHTTPSave Daniel

* nanohttp.c: John Kroll provided a small fix to xmlNanoHTTPSave
Daniel
diff --git a/nanohttp.c b/nanohttp.c
index c29cc7a..1b3566b 100644
--- a/nanohttp.c
+++ b/nanohttp.c
@@ -1312,7 +1312,7 @@
  */
 int
 xmlNanoHTTPSave(void *ctxt, const char *filename) {
-    char buf[4096];
+    char *buf = NULL;
     int fd;
     int len;