genirq: show_interrupts: Check desc->name before printing it blindly

desc->name is not required and not used by all architectures.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 4cc2e5e..760248d 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -405,7 +405,8 @@
 	for_each_online_cpu(j)
 		seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
 	seq_printf(p, " %8s", desc->irq_data.chip->name);
-	seq_printf(p, "-%-8s", desc->name);
+	if (desc->name)
+		seq_printf(p, "-%-8s", desc->name);
 
 	if (action) {
 		seq_printf(p, "  %s", action->name);