staging:ccg: cleanup a bit of binding

the ccg_bind_function uses ret variable and a logic around the
ccg_bind_enabled_functions to return a value other than 0 if
bind function fail, other wise returns 0, this can be achieved
with just a return ccg_bind_enabled_functions(dev, c);

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>