don't be smart about memory continuity

src/unix2db/main.zig

@@ -73,8 +73,10 @@ fn execute(
 
     var users = try User.fromReader(allocator, passwdFile.reader());
     defer for (users) |*user| user.deinit(allocator);
+    defer allocator.free(users);
     var groups = try Group.fromReader(allocator, groupFile.reader());
     defer for (groups) |*group| group.deinit(allocator);
+    defer allocator.free(groups);
 
     var corpus = try Corpus.init(allocator, users, groups);
     defer corpus.deinit();