bts: Early terminate TC_rec_invalid_frame on error

Extra debugging is added because otherwise it's extremely difficul to
find at which state the test is when debugging sporadic failures.

In f_TC_rec_invalid_frame, timer T is reused because it was actually not
being used before, only defined in there.

Change-Id: If24a81bf20d293b87adf9f37111fc7d344f169f5
1 file changed