llc_queue_merge_prepend(): constify readonly ptr param

Change-Id: Ib96bc75535fff94f1d953e37d217a6f954de8ada
---
M src/llc.c
M src/llc.h
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/llc.c b/src/llc.c
index 45b8ac4..633ae49 100644
--- a/src/llc.c
+++ b/src/llc.c
@@ -234,7 +234,7 @@
 }
 
 /* Prepend / Put back a previously dequeued LLC frame (llc_queue_dequeue()) */
-void llc_queue_merge_prepend(struct gprs_llc_queue *q, struct gprs_llc *llc)
+void llc_queue_merge_prepend(struct gprs_llc_queue *q, const struct gprs_llc *llc)
 {
 	struct MetaInfo *meta_storage;
 	unsigned int len = llc_frame_length(llc);
diff --git a/src/llc.h b/src/llc.h
index 594f77f..b9f3180 100644
--- a/src/llc.h
+++ b/src/llc.h
@@ -138,7 +138,7 @@
 void llc_queue_clear(struct gprs_llc_queue *q, struct gprs_rlcmac_bts *bts);
 void llc_queue_set_codel_interval(struct gprs_llc_queue *q, unsigned int interval);
 void llc_queue_move_and_merge(struct gprs_llc_queue *q, struct gprs_llc_queue *o);
-void llc_queue_merge_prepend(struct gprs_llc_queue *q, struct gprs_llc *llc);
+void llc_queue_merge_prepend(struct gprs_llc_queue *q, const struct gprs_llc *llc);
 void llc_queue_enqueue(struct gprs_llc_queue *q, struct msgb *llc_msg, const struct timespec *expire_time);
 struct msgb *llc_queue_dequeue(struct gprs_llc_queue *q, enum gprs_llc_queue_prio *out_prio, struct MetaInfo *out_info);
 

