set rangestringalloc to 0 after the string has been freed to prevent it

from being freed twice (a NULL free the second time)

lib/url.c

@@ -191,6 +191,7 @@ void static urlfree(struct UrlData *data, bool totally)
   if(data->bits.rangestringalloc) {
     free(data->range);
     data->range=NULL;
+    data->bits.rangestringalloc=0; /* free now */
   }
 
   if(data->ptr_proxyuserpwd) {
@@ -693,7 +694,7 @@ static CURLcode _connect(CURL *curl, CURLconnect **in_connect)
   char *tmp;
   char *buf;
   CURLcode result;
-  char resumerange[12]="";
+  char resumerange[40]="";
   struct UrlData *data = curl;
   struct connectdata *conn;
 #ifdef HAVE_SIGACTION