bus: arm-ccn: Fix warning message

A message warning a user about wrong vc value was printing
out port instead.
Reported-by: NDrew Richardson <drew.richardson@arm.com>
Signed-off-by: NPawel Moll <pawel.moll@arm.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>

drivers/bus/arm-ccn.c

@@ -662,7 +662,7 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
 		}
 		if (e->num_vcs && vc >= e->num_vcs) {
 			dev_warn(ccn->dev, "Invalid vc %d for node/XP %d!\n",
-					port, node_xp);
+					vc, node_xp);
 			return -EINVAL;
 		}
 		valid = 1;