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trau: detect 8k AMR 7.40k frames correctly for decoding

osmo_trau_frame_decode_8k() detects different possible frame
structures by their sync pattern bits.  The distinctive sync pattern
of AMR 7.40k format was checked incorrectly, thereby precluding
decoding of such frames.

Change-Id: Iad527d4141cf4d76feea56399ea1916813e1e941
---
M src/trau/trau_frame.c
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-abis refs/changes/31/38331/1

diff --git a/src/trau/trau_frame.c b/src/trau/trau_frame.c
index 966c794..8347303 100644
--- a/src/trau/trau_frame.c
+++ b/src/trau/trau_frame.c
@@ -1454,7 +1454,7 @@
 /*!< check sync pattern for AMR 7.4kBit/s */
 static bool is_amr_74(const ubit_t *bits)
 {
-	if (bits[0] != 0 || bits[1] != 0 || bits[2] != 0)
+	if (bits[0] != 0 || bits[1] != 0 || bits[2] != 1)
 		return false;
 	if (bits[8] != 0)
 		return false;

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