drivers: staging: greybus: Fixed CHECKS for brace issues

Added braces to else statements where checkpatch complained.

Signed-off-by: Chase Metzger <chasemetzger15@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>