BUG/MEDIUM: ssl: Don't forget to initialize ctx->send_recv and ctx->recv_wait.

When creating a new ssl_sock_ctx, don't forget to initialize its send_recv
and recv_wait to NULL, or we may end up dereferencing random values, and
crash.
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 6829823..5cc005b 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -5122,6 +5122,8 @@
 	ctx->sent_early_data = 0;
 	ctx->tmp_early_data = -1;
 	ctx->conn = conn;
+	ctx->send_wait = NULL;
+	ctx->recv_wait = NULL;
 
 	/* Only work with sockets for now, this should be adapted when we'll
 	 * add QUIC support.