dfu_prepare_function() allocates N+1 descriptor header structures,
the last one being the "DFU Functional Descriptor".
dfu_unbind() handles de-allocation, but fails to free the final
one (eg. "DFU Functional Descriptor"), leading to memory leak.
Fixed by incrementing counter, as in dfu_prepare_function().
Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
fe876984a4