[PATCH] powerpc: 52xx: add fallthrough in mpc52xx_wdt_ioctl()

[trix]

From: Tom Rix <trix@xxxxxxxxxx>

With gcc 10.3, there is this compiler error
compiler.h:56:26: error: this statement may
  fall through [-Werror=implicit-fallthrough=]

mpc52xx_gpt.c:586:2: note: here
  586 |  case WDIOC_GETTIMEOUT:
      |  ^~~~

So add the fallthrough pseudo keyword.

Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
---
 arch/powerpc/platforms/52xx/mpc52xx_gpt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
index 8c0d324f657e..3823df235f25 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
@@ -582,6 +582,7 @@ static long mpc52xx_wdt_ioctl(struct file *file, unsigned int cmd,
 		if (ret)
 			break;
 		/* fall through and return the timeout */
+		fallthrough;
 
 	case WDIOC_GETTIMEOUT:
 		/* we need to round here as to avoid e.g. the following
-- 
2.26.3