mtd: rawnand: timings: onfi_fill_data_interface timing mode is unsigned

Turn this argument into an unsigned int, as it cannot be signed. This
also spares a check.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200529111322.7184-15-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/internals.h

@@ -87,7 +87,7 @@ int nand_erase_nand(struct nand_chip *chip, struct erase_info *instr,
 int onfi_fill_data_interface(struct nand_chip *chip,
 			     struct nand_data_interface *iface,
 			     enum nand_data_interface_type type,
-			     int timing_mode);
+			     unsigned int timing_mode);
 int nand_get_features(struct nand_chip *chip, int addr, u8 *subfeature_param);
 int nand_set_features(struct nand_chip *chip, int addr, u8 *subfeature_param);
 int nand_read_page_raw_notsupp(struct nand_chip *chip, u8 *buf,

drivers/mtd/nand/raw/nand_timings.c

@@ -283,14 +283,14 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 int onfi_fill_data_interface(struct nand_chip *chip,
 			     struct nand_data_interface *iface,
 			     enum nand_data_interface_type type,
-			     int timing_mode)
+			     unsigned int timing_mode)
 {
 	struct onfi_params *onfi = chip->parameters.onfi;
 
 	if (type != NAND_SDR_IFACE)
 		return -EINVAL;
 
-	if (timing_mode < 0 || timing_mode >= ARRAY_SIZE(onfi_sdr_timings))
+	if (timing_mode >= ARRAY_SIZE(onfi_sdr_timings))
 		return -EINVAL;
 
 	*iface = onfi_sdr_timings[timing_mode];