[PATCH v2 2/6] hw/display/tcx: Add missing fall through comments

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

When building with GCC9 using CFLAG -Wimplicit-fallthrough=2 we get:

  hw/display/tcx.c: In function ‘tcx_dac_writel’:
  hw/display/tcx.c:453:26: error: this statement may fall through [-Werror=implicit-fallthrough=]
    453 |             s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */
        |             ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
  hw/display/tcx.c:454:9: note: here
    454 |         default:
        |         ^~~~~~~
  hw/display/tcx.c: In function ‘tcx_dac_readl’:
  hw/display/tcx.c:412:22: error: this statement may fall through [-Werror=implicit-fallthrough=]
    412 |         s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */
        |         ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
  hw/display/tcx.c:413:5: note: here
    413 |     default:
        |     ^~~~~~~
  cc1: all warnings being treated as errors

Give a hint to GCC by adding the missing fall through comments.

Fixes: 55d7bfe22
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
v2: Reword the description (Aleksandar)

Cc: Aleksandar Markovic <aleksandar.m.mail@gmail.com>
Cc: Olivier Danet <odanet@caramail.com>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/display/tcx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/display/tcx.c b/hw/display/tcx.c
index 14e829d3fa..abbeb30284 100644
--- a/hw/display/tcx.c
+++ b/hw/display/tcx.c
@@ -410,6 +410,7 @@ static uint64_t tcx_dac_readl(void *opaque, hwaddr addr,
     case 2:
         val = s->b[s->dac_index] << 24;
         s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */
+        /* fall through */
     default:
         s->dac_state = 0;
         break;
@@ -451,6 +452,7 @@ static void tcx_dac_writel(void *opaque, hwaddr addr, uint64_t val,
             s->b[index] = val >> 24;
             update_palette_entries(s, index, index + 1);
             s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */
+            /* fall through */
         default:
             s->dac_state = 0;
             break;
-- 
2.21.0