smux: remove `tick` argument from smux_trap()

smux_trap() contains an argument whose use appears to be to set
sysUpTime.0/timestamp field in SNMP trap. However, this value is not
used in smux_trap(). Moreover, it is expected that this field is the
value of sysUpTime.0 when the trap was sent and not any other time
related to the trap. To avoid any confusion, we remove this field from
the signature of the function.
diff --git a/bgpd/bgp_snmp.c b/bgpd/bgp_snmp.c
index f6b1056..a995ff6 100644
--- a/bgpd/bgp_snmp.c
+++ b/bgpd/bgp_snmp.c
@@ -853,7 +853,7 @@
   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 	     index, IN_ADDR_SIZE,
 	     bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
-	     bm->start_time - bgp_clock (), BGPESTABLISHED);
+	     BGPESTABLISHED);
 }
 
 void
@@ -872,7 +872,7 @@
   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 	     index, IN_ADDR_SIZE,
 	     bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
-	     bm->start_time - bgp_clock (), BGPBACKWARDTRANSITION);
+	     BGPBACKWARDTRANSITION);
 }
 
 void