gbproxy: Get the peer if paging by BVCI on SIG_BVC

Currently the code reports routing the message to a BVCI but never even
tries to get the peer for it.

Change-Id: Ic72f0f03e5886ab76404915fc60a2796e6881a7a
Related: SYS#4998
diff --git a/src/gbproxy/gb_proxy.c b/src/gbproxy/gb_proxy.c
index e8a81e7..ccf3f73 100644
--- a/src/gbproxy/gb_proxy.c
+++ b/src/gbproxy/gb_proxy.c
@@ -1105,6 +1105,7 @@
 		nsei);
 	if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) {
 		uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI));
+		peer = gbproxy_peer_by_bvci(cfg, bvci);
 		LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n",
 			bvci);
 		errctr = GBPROX_GLOB_CTR_OTHER_ERR;