irqchip/renesas-rzg2l: Clear the shared interrupt bit in rzg2l_irqc_free()

irqchip/renesas-rzg2l: Clear the shared interrupt bit in rzg2l_irqc_free()

rzg2l_irqc_free() invokes irq_domain_free_irqs_common(), which internally
calls irq_domain_reset_irq_data(). That explicitly sets irq_data->hwirq to
0. Consequently, irqd_to_hwirq(d) returns 0 when called after it.

Since 0 falls outside the valid shared IRQ ranges,
rzg2l_irqc_is_shared_and_get_irq_num() evaluates to false, completely
bypassing the test_and_clear_bit() operation.

This leaves the bit set in priv->used_irqs, causing future allocations to
fail with -EBUSY.

Fix this by retrieving irq_data and caching hwirq before calling
irq_domain_free_irqs_common().

Fixes: e0fcae27ff57 ("irqchip/renesas-rzg2l: Add shared interrupt support")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260328103324.134131-2-biju.das.jz@bp.renesas.com