connection_check: set ->data to the transfer doing the check

The http2 code for connection checking needs a transfer to use. Make
sure a working one is set before handler->connection_check() is called.

Reported-by: jnbr on github
Fixes #3541
Closes #3547

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/url.c b/lib/url.c
index bdb472999..bc47685db 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -964,6 +964,7 @@ static bool extract_if_dead(struct connectdata *conn,
       /* The protocol has a special method for checking the state of the
          connection. Use it to check if the connection is dead. */
       unsigned int state;
+      conn->data = data; /* use this transfer for now */
       state = conn->handler->connection_check(conn, CONNCHECK_ISDEAD);
       dead = (state & CONNRESULT_DEAD);
     }