mtd: spinand: propagate spinand_wait() errors from spinand_write_page()

mtd: spinand: propagate spinand_wait() errors from spinand_write_page()

Since commit 3d1f08b032dc ("mtd: spinand: Use the external ECC engine
logic") the spinand_write_page() function ignores the errors returned
by spinand_wait(). Change the code to propagate those up to the stack
as it was done before the offending change.

This is a port of linux commit
091d9e35b85b ("mtd: spinand: propagate spinand_wait() errors from spinand_write_page()")

Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> # U-Boot port
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>