gpio: stm32: cosmetic: cleanup gpio_stm32_probe

Move the variables definition at the beggining of the function
gpio_stm32_probe().

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/gpio/stm32_gpio.c b/drivers/gpio/stm32_gpio.c
index 5bff27f..aa70b1d 100644
--- a/drivers/gpio/stm32_gpio.c
+++ b/drivers/gpio/stm32_gpio.c
@@ -273,9 +273,12 @@
 static int gpio_stm32_probe(struct udevice *dev)
 {
 	struct stm32_gpio_priv *priv = dev_get_priv(dev);
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct ofnode_phandle_args args;
+	const char *name;
 	struct clk clk;
 	fdt_addr_t addr;
-	int ret;
+	int ret, i;
 
 	addr = dev_read_addr(dev);
 	if (addr == FDT_ADDR_T_NONE)
@@ -283,11 +286,6 @@
 
 	priv->regs = (struct stm32_gpio_regs *)addr;
 
-	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
-	struct ofnode_phandle_args args;
-	const char *name;
-	int i;
-
 	name = dev_read_string(dev, "st,bank-name");
 	if (!name)
 		return -EINVAL;