Destroy the lock in object finalization.

src/vmod_file.c

@@ -607,6 +607,15 @@ vmod_reader__fini(struct VPFX(file_reader) **rdrp)
 		return;
 	TAKE_OBJ_NOTNULL(rdr, rdrp, FILE_READER_MAGIC);
 
+	if (rdr->lock != NULL) {
+		errno = 0;
+		if (pthread_rwlock_destroy(rdr->lock) != 0)
+			VSL(SLT_Error, NO_VXID, "vmod file %s.%s finalization: "
+			    "cannot destroy lock: %s", rdr->vcl_name,
+			    rdr->obj_name, VAS_errtxt(errno));
+		free(rdr->lock);
+	}
+
 	if (rdr->flags & RDR_TIMER_INIT) {
 		AN(rdr->obj_name);
 
@@ -634,8 +643,6 @@ vmod_reader__fini(struct VPFX(file_reader) **rdrp)
 		free(rdr->obj_name);
 	if (rdr->errbuf != NULL)
 		free(rdr->errbuf);
-	if (rdr->lock != NULL)
-		free(rdr->lock);
 	FREE_OBJ(rdr);
 }