If we need a bigger buffer, we reallocte a new buffer and free the old
one.

Note: This change is tested to compile only as I don't have the
hardware.
Signed-off-by: NFlorian Mickler <florian@mickler.org>
Cc: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>