Blackfin arch: Fix bug - when expanding the trace buffer, it does not print...

Blackfin arch: Fix bug - when expanding the trace buffer, it does not print out the decoded instruction.

as pointed out by Michael McTernan in the forums, when expanding
the trace buffer, it does not print out the decoded instruction.

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>