BUG/MINOR: quic: Wrong initialization for io_cb_wakeup boolean

This bug arrives with this commit:
    982896961 MINOR: quic: split and rename qc_lstnr_pkt_rcv()
The first block of code consists in possibly setting this variable to true.
But it was already initialized to true before entering this code section.
Should be initialized to false.

Also take the opportunity to remove an unused "err" label.

Must be backported to 2.6 and 2.7.
diff --git a/src/quic_conn.c b/src/quic_conn.c
index 5124243..ebbf003 100644
--- a/src/quic_conn.c
+++ b/src/quic_conn.c
@@ -6589,7 +6589,7 @@
 	const struct quic_version *qv = pkt->version;
 	struct quic_enc_level *qel = NULL;
 	size_t b_cspace;
-	int io_cb_wakeup = 1;
+	int io_cb_wakeup = 0;
 
 	TRACE_ENTER(QUIC_EV_CONN_LPKT, qc, pkt, NULL, qv);
 
@@ -6657,7 +6657,6 @@
 
  drop:
 	HA_ATOMIC_INC(&qc->prx_counters->dropped_pkt);
- err:
 	if (io_cb_wakeup) {
 		TRACE_DEVEL("needs to wakeup the timer task after the amplification limit was reached",
 		            QUIC_EV_CONN_LPKT, qc);