rtp2trau_hr16: set D bits correctly

The original code failed to do the step of osmo_pbit2ubit() for
transferring HRv1 payload bits from packed to unpacked form,
instead doing the bogon of memcpy()ing the RTP payload directly
into tf->d_bits array - fix it.  Also set all D bits to zeros
in the case of empty payload input - not ideal, but better than
transmitting uninitialized memory content.

Change-Id: Icb6a21a12fe82f6637f327d45bd843686a90a458
---
M src/trau/trau_rtp_conv.c
1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/trau/trau_rtp_conv.c b/src/trau/trau_rtp_conv.c
index 4a62cc0..cf8d12e 100644
--- a/src/trau/trau_rtp_conv.c
+++ b/src/trau/trau_rtp_conv.c
@@ -425,7 +425,9 @@
 		tf->ufi = 1;
 	/* CRC is computed by TRAU frame encoder */
 	if (data_len)
-		memcpy(tf->d_bits, data, GSM_HR_BYTES);
+		osmo_pbit2ubit(tf->d_bits, data, GSM_HR_BYTES * 8);
+	else
+		memset(tf->d_bits, 0, GSM_HR_BYTES * 8);
 
 	return 0;
 }

