target/cris: Remove superfluous breaks

Remove superfluous breaks, as there is a "return" before them.

Signed-off-by: Liao Pingfang <liao.pingfang@zte.com.cn>
Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1594631150-36801-1-git-send-email-wang.yi59@zte.com.cn>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/target/cris/translate.c b/target/cris/translate.c
index ee5e359..c312e6f 100644
--- a/target/cris/translate.c
+++ b/target/cris/translate.c
@@ -1178,12 +1178,11 @@
 static char memsize_char(int size)
 {
     switch (size) {
-    case 1: return 'b';  break;
-    case 2: return 'w';  break;
-    case 4: return 'd';  break;
+    case 1: return 'b';
+    case 2: return 'w';
+    case 4: return 'd';
     default:
         return 'x';
-        break;
     }
 }
 #endif