Fix EGPRS PUAN encoding: use correct urbb_len

Earlier there was an incorrect encoding of PUAN when VQ is not equal
VR case for EGPRS UL RLC window. The PCU was encoding the same PUAN
message always irrespective of radio condition. This was a bottle neck
for performance testing. Which has been fixed in this patch.

Related: OS#1793

unit test assertion in the previous commit is fixed in this patch.

Change-Id: Iba7b1995028bd81749ffb080616b2ad5f2540d57
diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 8ec1dcc..5e40abc 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -753,9 +753,8 @@
 
 	msg1 = ul_tbf->create_ul_ack(*fn, ts_no);
 
-	/* TODO: Need to modify the assert */
 	OSMO_ASSERT(!strcmp(osmo_hexdump(msg1->data, msg1->data_len),
-	"40 24 01 3f 3e 24 46 68 90 87 b0 06 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b "
+	"40 24 01 3f 3e 24 46 68 90 88 b0 06 8b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b "
 	));
 
 	return ul_tbf;
diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err
index c3a7f20..452f1c1 100644
--- a/tests/tbf/TbfTest.err
+++ b/tests/tbf/TbfTest.err
@@ -6307,8 +6307,8 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW EGPRS): data_length=37, data=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 - Raising V(R) to 5
 Encoding Ack/Nack for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW EGPRS) (final=0)
- - EGPRS URBB, len = 0, SSN = 3, ESN_CRBB = 2, SNS = 2048, WS = 64, V(Q) = 2, V(R) = 5, BOW, EOW
-Uplink Ack/Nack bit count 98, max 184, message = 40 24 01 3f 3e 24 46 68 90 87 b0 06 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+ - EGPRS URBB, len = 2, SSN = 3, ESN_CRBB = 2, SNS = 2048, WS = 64, V(Q) = 2, V(R) = 5, BOW, EOW
+Uplink Ack/Nack bit count 100, max 184, message = 40 24 01 3f 3e 24 46 68 90 88 b0 06 8b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
 Got 'TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW EGPRS)', TA=7
 Got MS: TLLI = 0xf1223344, TA = 7
 ********** TBF starts here **********