More sonarlint work

src/disk/hdc_st506_xt.c

@@ -623,6 +623,8 @@ st506_callback(void *priv)
                 st506_complete(dev);
                 break;
             }
+            [[fallthrough]];
+
         case CMD_FORMAT_TRACK:
         case CMD_FORMAT_BAD_TRACK:
             switch (dev->state) {
@@ -1604,7 +1606,7 @@ st506_init(const device_t *info)
 
         case ST506_XT_TYPE_ST11R: /* Seagate ST-11R (RLL) */
             dev->spt = RLL_SECTORS;
-            /*FALLTHROUGH*/
+            [[fallthrough]];
 
         case ST506_XT_TYPE_ST11M: /* Seagate ST-11M (MFM) */
             dev->nr_err   = ERR_NOT_AVAILABLE;