[PATCH] rapidio/mport_cdev: mark expected switch fall-through

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

n preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/rapidio/devices/rio_mport_cdev.c: In function ‘mport_release_mapping’:
drivers/rapidio/devices/rio_mport_cdev.c:2151:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   rio_unmap_inb_region(mport, map->phys_addr);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC      drivers/regulator/fixed-helper.o
  CC      drivers/pinctrl/stm32/pinctrl-stm32f429.o
drivers/rapidio/devices/rio_mport_cdev.c:2152:2: note: here
  case MAP_DMA:
  ^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/rapidio/devices/rio_mport_cdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index cbe467ff1aba..1e1f42e210a0 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -2149,6 +2149,7 @@ static void mport_release_mapping(struct kref *ref)
 	switch (map->dir) {
 	case MAP_INBOUND:
 		rio_unmap_inb_region(mport, map->phys_addr);
+		/* fall through */
 	case MAP_DMA:
 		dma_free_coherent(mport->dev.parent, map->size,
 				  map->virt_addr, map->phys_addr);
-- 
2.20.1