pcu: Fix race condition in TC_t3141

The test was expecting to always receive at least 1 DL packet with
USF_UNUSED, but since we implemented idle blocks in PCUIF that may not
always be the case anymore. If the TBF is freed in between last
requested block and next one, there may be no TBF and hence no MS
listening on the TS, so PCU will optimize and send an idle block.

Change-Id: Ia301c01a3f5c3fd0b11d8f20e39061aa7abc6127
1 file changed