fs: fat: fix seconds in timestamp

fs: fat: fix seconds in timestamp

The FAT time format stores seconds/2 in bits 4:0. The expression
'tm.tm_sec > 1' is a boolean comparison (yields 0 or 1) where a
right-shift 'tm.tm_sec >> 1' was intended.  As a result every
file timestamp written by U-Boot has its seconds field set to
either 0 or 1, depending on whether tm_sec is greater than 1.

Also fix the indentation of the tm_hour line.

Fixes: ba23c378c544 ("fs: fat: fill creation and change date")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>