Normalise /*FALLTHR{OUGH,U}*/

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Issue #12201

cmd/mount_zfs/mount_zfs.c

@@ -368,8 +368,8 @@ main(int argc, char **argv)
 				    "mount the filesystem again.\n"), dataset);
 				return (MOUNT_SYSERR);
 			}
-			/* fallthru */
 #endif
+			/* FALLTHROUGH */
 		default:
 			(void) fprintf(stderr, gettext("filesystem "
 			    "'%s' can not be mounted: %s\n"), dataset,

cmd/zdb/zdb.c

@@ -4612,7 +4612,7 @@ dump_path_impl(objset_t *os, uint64_t obj, char *name, uint64_t *retobj)
 	case DMU_OT_DIRECTORY_CONTENTS:
 		if (s != NULL && *(s + 1) != '\0')
 			return (dump_path_impl(os, child_obj, s + 1, retobj));
-		/*FALLTHROUGH*/
+		/* FALLTHROUGH */
 	case DMU_OT_PLAIN_FILE_CONTENTS:
 		if (retobj != NULL) {
 			*retobj = child_obj;

cmd/zfs/zfs_main.c

@@ -4510,7 +4510,6 @@ zfs_do_send(int argc, char **argv)
 			usage(B_FALSE);
 			break;
 		case '?':
-			/*FALLTHROUGH*/
 		default:
 			/*
 			 * If an invalid flag was passed, optopt contains the

cmd/zpool_influxdb/zpool_influxdb.c

@@ -118,6 +118,7 @@ escape_string(const char *s)
 		case '=':
 		case '\\':
 			*d++ = '\\';
+			/* FALLTHROUGH */
 		default:
 			*d = *c;
 		}