staging: fbtft: Fix indentation style by space

This patch fixes the checkpatch.pl warning and error:

WARNING: please, no spaces at the start of a line

ERROR: code indent should use tabs where possible
Signed-off-by: Helen Fornazier <helen.fornazier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>