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rtp: Avoid memcpy(len=0)

Change-Id: I7618c6509b67465d21271ea632bccc8cf11e4852
---
M src/rtp.c
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-netif refs/changes/44/29044/1

diff --git a/src/rtp.c b/src/rtp.c
index 5c06c42..f4b0ada 100644
--- a/src/rtp.c
+++ b/src/rtp.c
@@ -199,7 +199,8 @@
 	rtph->timestamp = htonl(h->tx.timestamp);
 	h->tx.timestamp += duration;
 	rtph->ssrc = htonl(h->tx.ssrc);
-	memcpy(msg->data + sizeof(struct rtp_hdr), data, payload_len);
+	if (payload_len > 0)
+		memcpy(msg->data + sizeof(struct rtp_hdr), data, payload_len);
 	msgb_put(msg, sizeof(struct rtp_hdr) + payload_len);
 
 	return msg;

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