dm: gpio: pca953x: Drop pointless data structure checks

These checks cannot fail since driver model will not call a driver's
method if it cannot fully create the driver data structures.

It is confusing to have these checks and others might copy them. Drop this
code.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/gpio/pca953x_gpio.c

@@ -249,22 +249,11 @@ static int pca953x_probe(struct udevice *dev)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
-	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
 	char name[32], *str;
 	int addr;
 	ulong driver_data;
 	int ret;
 
-	if (!info) {
-		dev_err(dev, "platdata not ready\n");
-		return -ENOMEM;
-	}
-
-	if (!chip) {
-		dev_err(dev, "i2c not ready\n");
-		return -ENODEV;
-	}
-
 	addr = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", 0);
 	if (addr == 0)
 		return -ENODEV;