Use fn_valid() helper in pcu_rx_time_ind()

Change-Id: I5b1f1d4cd621d81fb99b87761a878af242227a10
---
M src/pcu_l1_if.cpp
1 file changed, 10 insertions(+), 3 deletions(-)


git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/38/33138/1

diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index e675d86..3f881cf 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -1036,10 +1036,8 @@
 
 static int pcu_rx_time_ind(struct gprs_rlcmac_bts *bts, struct gsm_pcu_if_time_ind *time_ind)
 {
-	uint8_t fn13 = time_ind->fn % 13;
-
 	/* omit frame numbers not starting at a MAC block */
-	if (fn13 != 0 && fn13 != 4 && fn13 != 8)
+	if (!fn_valid(time_ind->fn))
 		return 0;
 
 	LOGP(DL1IF, LOGL_DEBUG, "Time indication received: %d\n", time_ind->fn % 52);

