staging: greybus: hid: remove braces {} around single statement block

This patch fixes the checkpatch.pl warning:

WARNING: braces {} are not necessary for single statement blocks

This is the only instance of the problem noted by
checkpatch.pl in staging: greybus.

Signed-off-by: Dan Jessie <dtjessie@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20200328222134.19344-1-dtjessie@gmail.com


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