firmware: apps/cardem/main.c: Synchronize with apps/trace/main.c

In the end we want to share most of this, irrespective of the "APP".
Let's avoid unnecessary differences.

Change-Id: Icf063d4ca79edf66ffbe8e87a915deb77dec478a
diff --git a/firmware/apps/cardem/main.c b/firmware/apps/cardem/main.c
index f6a5ab5..3476af2 100644
--- a/firmware/apps/cardem/main.c
+++ b/firmware/apps/cardem/main.c
@@ -39,7 +39,7 @@
 	void (*exit) (void);
 	/* main loop content for given configuration */
 	void (*run) (void);
-	/* Interrupt handler for USART1 */
+	/* Interrupt handler for USART0 */
 	void (*usart0_irq) (void);
 	/* Interrupt handler for USART1 */
 	void (*usart1_irq) (void);
@@ -53,6 +53,8 @@
 		.init = Sniffer_init,
 		.exit = Sniffer_exit,
 		.run = Sniffer_run,
+		.usart0_irq = Sniffer_usart0_irq,
+		.usart1_irq = Sniffer_usart1_irq,
 	},
 #endif
 #ifdef HAVE_CCID
@@ -174,8 +176,7 @@
 	}
 
 	TRACE_INFO("calling configure of all configurations...\n\r");
-	for (i = 1; i < sizeof(config_func_ptrs) / sizeof(config_func_ptrs[0]);
-	     ++i) {
+	for (i = 1; i < ARRAY_SIZE(config_func_ptrs); i++) {
 		if (config_func_ptrs[i].configure)
 			config_func_ptrs[i].configure();
 	}