irqchip: Use int type to store negative error codes

Change the 'ret' variable from unsigned int to int to store negative error
codes or zero returned by other functions.

Storing the negative error codes in unsigned type, doesn't cause an issue
at runtime but assigning negative error codes to unsigned type may trigger
a compiler warning when the -Wsign-conversion flag is enabled.

Signed-off-by: Qianfeng Rong <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Acked-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]

drivers/irqchip/irq-gic-v3.c

···
 				 struct irq_fwspec *fwspec,
 				 enum irq_domain_bus_token bus_token)
 {
-	unsigned int type, ret, ppi_idx;
+	unsigned int type, ppi_idx;
 	irq_hw_number_t hwirq;
+	int ret;
 
 	/* Not for us */
 	if (fwspec->fwnode != d->fwnode)

drivers/irqchip/irq-nvic.c

···
 			       struct device_node *parent)
 {
 	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
-	unsigned int irqs, i, ret, numbanks;
+	unsigned int irqs, i, numbanks;
 	void __iomem *nvic_base;
+	int ret;
 
 	numbanks = (readl_relaxed(V7M_SCS_ICTR) &
 		    V7M_SCS_ICTR_INTLINESNUM_MASK) + 1;

drivers/irqchip/irq-renesas-rza1.c

···
 static int rza1_irqc_parse_map(struct rza1_irqc_priv *priv,
 			       struct device_node *gic_node)
 {
-	unsigned int imaplen, i, j, ret;
 	struct device *dev = priv->dev;
+	unsigned int imaplen, i, j;
 	struct device_node *ipar;
 	const __be32 *imap;
 	u32 intsize;
+	int ret;
 
 	imap = of_get_property(dev->of_node, "interrupt-map", &imaplen);
 	if (!imap)