genirq: Remove unnecessary memset() calls

sprintf() and snprintf() implementation of kernel guarantees that
its result is terminated with null byte if size is larger than 0. So we
don't need to call memset() at all.
Signed-off-by: Weongyo Jeong <weongyo.linux@gmail.com>
Link: http://lkml.kernel.org/r/1459451703-5744-1-git-send-email-weongyo.linux@gmail.comSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/irq/proc.c

@@ -311,7 +311,6 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
 					!name_unique(irq, action))
 		return;
 
-	memset(name, 0, MAX_NAMELEN);
 	snprintf(name, MAX_NAMELEN, "%s", action->name);
 
 	/* create /proc/irq/1234/handler/ */
@@ -340,7 +339,6 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
 	if (desc->dir)
 		goto out_unlock;
 
-	memset(name, 0, MAX_NAMELEN);
 	sprintf(name, "%d", irq);
 
 	/* create /proc/irq/1234 */
@@ -386,7 +384,6 @@ void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
 #endif
 	remove_proc_entry("spurious", desc->dir);
 
-	memset(name, 0, MAX_NAMELEN);
 	sprintf(name, "%u", irq);
 	remove_proc_entry(name, root_irq_dir);
 }