[PATCH] mmc: sdhci-brcmstb: Resolve "unused" warnings with CONFIG_OF=n

[Brian Norris]

With W=1, we can see this gcc warning:

drivers/mmc/host/sdhci-brcmstb.c:182:34: warning: ‘sdhci_brcm_of_match’ defined but not used [-Wunused-const-variable=]
  182 | static const struct of_device_id sdhci_brcm_of_match[] = {
      |                                  ^~~~~~~~~~~~~~~~~~~

Rather than play around more with #ifdef's, the simplest solution is to
just mark this __maybe_unused.

Fixes: 1fad8422c989 ("mmc: sdhci-brcmstb: Allow building with COMPILE_TEST")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/all/202212060700.NjMecjxS-lkp@xxxxxxxxx/
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
---

 drivers/mmc/host/sdhci-brcmstb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index 55d8bd232695..f2cf3d70db79 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -179,7 +179,7 @@ static const struct brcmstb_match_priv match_priv_7216 = {
 	.ops = &sdhci_brcmstb_ops_7216,
 };
 
-static const struct of_device_id sdhci_brcm_of_match[] = {
+static const struct of_device_id __maybe_unused sdhci_brcm_of_match[] = {
 	{ .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 },
 	{ .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 },
 	{ .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 },
-- 
2.39.0.rc0.267.gcb52ba06e7-goog