platform/surface: fix semicolon.cocci warnings

drivers/platform/surface/surface_dtx.c:651:2-3: Unneeded semicolon

 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

Fixes: 1d609992 ("platform/surface: Add DTX driver")
CC: Maximilian Luz <luzmaximilian@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20210319051919.GA39801@ae4f36e4f012Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/surface/surface_dtx.c

@@ -649,7 +649,7 @@ static u32 sdtx_notifier(struct ssam_event_notifier *nf, const struct ssam_event
 
 	default:
 		return 0;
-	};
+	}
 
 	if (in->length != len) {
 		dev_err(ddev->dev,