Re: [PATCH] drivers/macintosh/smu.c: Mark expected switch fall-through

Mark switch cases where we are expecting to fall through.

This patch fixes the following warning (Building: powerpc):

drivers/macintosh/smu.c: In function 'smu_queue_i2c':
drivers/macintosh/smu.c:854:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
   cmd->info.devaddr &= 0xfe;
   ~~~~~~~~~~~~~~~~~~^~~~~~~
drivers/macintosh/smu.c:855:2: note: here
  case SMU_I2C_TRANSFER_STDSUB:
  ^~~~

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Gustavo A. R. Silva <redacted>
Cc: Kees Cook <redacted>
Signed-off-by: Stephen Rothwell <redacted>
---
 drivers/macintosh/smu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 276065c888bc..23f1f41c8602 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c

@@ -852,6 +852,7 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd)
 		break;
 	case SMU_I2C_TRANSFER_COMBINED:
 		cmd->info.devaddr &= 0xfe;
+		/* fall through */
 	case SMU_I2C_TRANSFER_STDSUB:
 		if (cmd->info.sublen > 3)
 			return -EINVAL;