[PATCH] clk: ralink: mtmips: quiet unused variable warning

[Sergio Paracuellos <sergio.paracuellos@gmail.com>]

When CONFIG_OF is disabled then the matching table is not referenced and
the following warning appears:

drivers/clk/ralink/clk-mtmips.c:821:34: warning: unused variable 'mtmips_of_match' [-Wunused-const-variable]
821 |   static const struct of_device_id mtmips_of_match[] = {
    |                          ^

Silence it declaring 'mtmips_of_match' with '__maybe_unused'.

Fixes: 6f3b15586eef ("clk: ralink: add clock and reset driver for MTMIPS SoCs")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307242310.CdOnd2py-lkp@intel.com/
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
---
 drivers/clk/ralink/clk-mtmips.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/ralink/clk-mtmips.c b/drivers/clk/ralink/clk-mtmips.c
index 1e7991439527..6716394b28a3 100644
--- a/drivers/clk/ralink/clk-mtmips.c
+++ b/drivers/clk/ralink/clk-mtmips.c
@@ -820,7 +820,7 @@ static const struct mtmips_clk_data mt76x8_clk_data = {
 	.num_clk_periph = ARRAY_SIZE(mt76x8_pherip_clks),
 };
 
-static const struct of_device_id mtmips_of_match[] = {
+static const __maybe_unused struct of_device_id mtmips_of_match[] = {
 	{
 		.compatible = "ralink,rt2880-sysc",
 		.data = &rt2880_clk_data,
-- 
2.25.1