mtd: spi-nor: Fix multiple coding style issues

The offset variable is set, but never used afterward.
Fix indent. Fix predecrement without justification.
Remove use of parenthesis where unnecessary.

Fixes: 5d40b3d384dc ("mtd: spi-nor: Add parallel and stacked memories support")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
1 file changed