cookie: avoid fopen with empty file name

Closes #12514

diff --git a/lib/cookie.c b/lib/cookie.c
index 1bd80ff5b3e5b3e6b0e240fe6a7df576689cd76f..5f158395b6f6f34ced17a201f158fc99d6bc57cf 100644 (file)
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -1227,7 +1227,7 @@ struct CookieInfo *Curl_cookie_init(struct Curl_easy *data,
 
   if(data) {
     FILE *fp = NULL;
-    if(file) {
+    if(file && *file) {
       if(!strcmp(file, "-"))
         fp = stdin;
       else {