wp_redirect must return true

[tivnet]

A code like this one

if(wp_redirect('/', 301)){
	error_log('redirected');
}

won't work because in the case of success, wp_redirect returns NULL, while it must return a boolean value (true if all was OK)

[rmccue]

Broken since r4407

[ryan]

In 24996:

Return true from wp_redirect() when redirect successful. Update phpdoc.

Props tivnet
fixes #24969

[c3mdigital]

#17472 was marked as a duplicate.