drivers: intc: check if clock device is ready before accessing

Add check for device_is_ready() before accessing clock control devices.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

drivers/interrupt_controller/intc_mchp_ecia_xec.c

@@ -515,6 +515,10 @@ static int xec_ecia_init(const struct device *dev)
 	uint32_t n = 0, nr = 0;
 	int ret;
 
+	if (!device_is_ready(clk_dev)) {
+		return -ENODEV;
+	}
+
 	ret = clock_control_on(clk_dev,
 			       (clock_control_subsys_t *)&cfg->clk_ctrl);
 	if (ret < 0) {

drivers/interrupt_controller/intc_rv32m1_intmux.c

@@ -154,6 +154,10 @@ static int rv32m1_intmux_init(const struct device *dev)
 	INTMUX_Type *regs = DEV_REGS(dev);
 	size_t i;
 
+	if (!device_is_ready(config->clock_dev)) {
+		return -ENODEV;
+	}
+
 	/* Enable INTMUX clock. */
 	clock_control_on(config->clock_dev, config->clock_subsys);