MINOR: quic: Missing encryption level rx.crypto member initialization and lock.

->rx.crypto member of quic_enc_level struct was not initialized as
this was done for all other members of this structure. This patch
fixes this.
Also adds a RW lock for the frame of this member.
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index eec3b5c..cc560a9 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -2719,6 +2719,9 @@
 	qel->rx.pkts = EB_ROOT;
 	HA_RWLOCK_INIT(&qel->rx.rwlock);
 	MT_LIST_INIT(&qel->rx.pqpkts);
+	qel->rx.crypto.offset = 0;
+	qel->rx.crypto.frms = EB_ROOT_UNIQUE;
+	HA_RWLOCK_INIT(&qel->rx.crypto.frms_rwlock);
 
 	/* Allocate only one buffer. */
 	qel->tx.crypto.bufs = malloc(sizeof *qel->tx.crypto.bufs);