staging: fbtft: fix braces {} are not necessary for single statement blocks

This patch fixes the following checkpatch.pl warning:
braces {} are not necessary for single statement blocks

Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>