Normalise /*FALLTHR{OUGH,U}*/

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

cmd/zpool_influxdb/zpool_influxdb.c

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