staging: greybus: tools: Fix braces {} style

This patch fixes the check reported by checkpatch.pl
for braces {} should be used on all arms of this statement.

Signed-off-by: Simran Singhal <singhalsimran0@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20200322173045.GA24700@simran-Inspiron-5558


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>