greybus: gpio-gb: remove checks for negative offset variable

offset is defined as unsigned so there is no point checking for
negative values of offset.
Signed-off-by: NBill Pemberton <wfp5p@worldbroken.com>
Signed-off-by: NGreg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/gpio-gb.c

@@ -312,7 +312,7 @@ static int gb_gpio_request(struct gpio_chip *chip, unsigned offset)
 	struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip);
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 	ret = gb_gpio_activate_operation(gb_gpio_controller, (u8)offset);
 	if (ret)
@@ -325,7 +325,7 @@ static void gb_gpio_free(struct gpio_chip *chip, unsigned offset)
 	struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip);
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio) {
+	if (offset >= chip->ngpio) {
 		pr_err("bad offset %u supplied (must be 0..%u)\n",
 			offset, chip->ngpio - 1);
 		return;
@@ -341,7 +341,7 @@ static int gb_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 	u8 which;
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 	which = (u8)offset;
 	ret = gb_gpio_get_direction_operation(gb_gpio_controller, which);
@@ -355,7 +355,7 @@ static int gb_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 	struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip);
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 	ret = gb_gpio_direction_in_operation(gb_gpio_controller, (u8)offset);
 	if (ret)
@@ -369,7 +369,7 @@ static int gb_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 	struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip);
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 	ret = gb_gpio_direction_out_operation(gb_gpio_controller, (u8)offset, !!value);
 	if (ret)
@@ -383,7 +383,7 @@ static int gb_gpio_get(struct gpio_chip *chip, unsigned offset)
 	u8 which;
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 	which = (u8)offset;
 	ret = gb_gpio_get_value_operation(gb_gpio_controller, which);
@@ -414,7 +414,7 @@ static int gb_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
 	u16 usec;
 	int ret;
 
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 	if (debounce > (unsigned int)U16_MAX)
 		return -EINVAL;
@@ -428,7 +428,7 @@ static int gb_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
 
 static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
-	if (offset < 0 || offset >= chip->ngpio)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 
 	return 0;	/* XXX */