[PATCH 8/9] target/ppc: silence the compiler warnings

[Chen Qun]

When using -Wimplicit-fallthrough in our CFLAGS, the compiler showed warning:
target/ppc/mmu_helper.c: In function ‘dump_mmu’:
target/ppc/mmu_helper.c:1351:12: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
 1351 |         if (ppc64_v3_radix(env_archcpu(env))) {
      |            ^
target/ppc/mmu_helper.c:1358:5: note: here
 1358 |     default:
      |     ^~~~~~~

Add the corresponding "fall through" comment to fix it.

Reported-by: Euler Robot <euler.ro...@huawei.com>
Signed-off-by: Chen Qun <kuhn.chen...@huawei.com>
---
Cc: David Gibson <da...@gibson.dropbear.id.au>
---
 target/ppc/mmu_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/ppc/mmu_helper.c b/target/ppc/mmu_helper.c
index 8972714775..51749b62df 100644
--- a/target/ppc/mmu_helper.c
+++ b/target/ppc/mmu_helper.c
@@ -1355,6 +1355,7 @@ void dump_mmu(CPUPPCState *env)
             break;
         }
 #endif
+        /* fall through */
     default:
         qemu_log_mask(LOG_UNIMP, "%s: unimplemented\n", __func__);
     }
-- 
2.27.0