Mark switch cases where we are expecting to fall through.

This patch fixes the following warning (Building: i386):

drivers/net/hamradio/baycom_epp.c: In function ‘transmit’:
drivers/net/hamradio/baycom_epp.c:491:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    if (i) {
       ^
drivers/net/hamradio/baycom_epp.c:504:3: note: here
   default:  /* fall through */
   ^~~~~~~

Notice that, in this particular case, the code comment is
modified in accordance with what GCC is expecting to find.

Signed-off-by: Gustavo A. R. Silva <redacted>
---
 drivers/net/hamradio/baycom_epp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index daab2c07d891..9303aeb2595f 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c

@@ -500,8 +500,9 @@ static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 				}
 				break;
 			}
+			/* fall through */
 
-		default:  /* fall through */
+		default:
 			if (bc->hdlctx.calibrate <= 0)
 				return 0;
 			i = min_t(int, cnt, bc->hdlctx.calibrate);

-- 
2.22.0