all: Add 'U' suffix when using unsigned variables

Add a 'U' suffix to values when computing and comparing against
unsigned variables.

Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
diff --git a/drivers/interrupt_controller/shared_irq.c b/drivers/interrupt_controller/shared_irq.c
index a3968da..7af6a33 100644
--- a/drivers/interrupt_controller/shared_irq.c
+++ b/drivers/interrupt_controller/shared_irq.c
@@ -52,7 +52,7 @@
 
 	for (i = 0U; i < config->client_count; i++) {
 		if (clients->client[i].isr_dev == isr_dev) {
-			clients->client[i].enabled = 1;
+			clients->client[i].enabled = 1U;
 			irq_enable(config->irq_num);
 			return 0;
 		}
@@ -84,7 +84,7 @@
 
 	for (i = 0U; i < config->client_count; i++) {
 		if (clients->client[i].isr_dev == isr_dev) {
-			clients->client[i].enabled = 0;
+			clients->client[i].enabled = 0U;
 			if (last_enabled_isr(clients, config->client_count)) {
 				irq_disable(config->irq_num);
 			}