This patch removes the WARN_ONCE() test in spi_nor_write().
This macro triggers the display of a warning message almost every time we
use a UBI file-system because a write operation is performed at offset 64,
which is in the middle of the SPI NOR memory page. This is a valid
operation for ubifs.

Hence this warning is pretty annoying and useless so we just remove it.
Signed-off-by: NCyrille Pitchen <cyrille.pitchen@atmel.com>
Suggested-by: NRichard Weinberger <richard@nod.at>
Suggested-by: NAndras Szemzo <szemzo.andras@gmail.com>
Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com>