try patch 1

-- curl version=[8.17.1-DEV]
-- The C compiler identification is GNU 14.2.0

/home/runner/work/curl-for-win/curl-for-win/curl/lib/conncache.c: In function 'Curl_cpool_conn_now_idle':
/home/runner/work/curl-for-win/curl-for-win/curl/lib/conncache.c:539:11: error: null pointer dereference [-Werror=null-dereference]
  539 |   if(!data->multi->maxconnects) {
      |       ~~~~^~~~~~~
cc1: all warnings being treated as errors

https://github.com/curl/curl-for-win/actions/runs/19111497271/job/54609512969#step:3:5788

-- The C compiler identification is GNU 14.3.0
https://github.com/curl/curl-for-win/actions/runs/19111497271/job/54609512899#step:3:5801

Author: vszakats

curl.dev.patch

@@ -51,3 +51,17 @@ index 975ef2a458..5d71f1bd08 100644
    return config;
  }
 
+diff --git a/lib/conncache.c b/lib/conncache.c
+index d5770ef916..7dc21d967a 100644
+--- a/lib/conncache.c
++++ b/lib/conncache.c
+@@ -536,6 +536,9 @@ bool Curl_cpool_conn_now_idle(struct Curl_easy *data,
+   struct cpool *cpool = cpool_get_instance(data);
+   bool kept = TRUE;
+ 
++  if(!data)
++    return kept;
++
+   if(!data->multi->maxconnects) {
+     unsigned int running = Curl_multi_xfers_running(data->multi);
+     maxconnects = (running <= UINT_MAX / 4) ? running * 4 : UINT_MAX;