genirq: Move clear of kstat_irqs to free_desc()

genirq: Move clear of kstat_irqs to free_desc()

desc_set_defaults() has a loop to clear the per-cpu counters kstats_irq.

This is only needed in free_desc(), which is used with non-sparse IRQs so
that the interrupt descriptor can be recycled. For newly allocated
descriptors, the memory comes from alloc_percpu() and is already zeroed
out.

Move the loop to free_desc() to avoid wasting time unnecessarily.

Signed-off-by: Luigi Rizzo <lrizzo@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260112083234.2665832-1-lrizzo@google.com