Widget Search code not valid (w3c)

Hello, with widgetsidebar, “Search” is not valid at
https://validator.w3.org/
that say:
document type does not allow element “label” here; missing one of “p”, “h1”, “h2”, “h3”, “h4”, “h5”, “h6”, “div”, “pre”, “address”, “fieldset”, “ins”, “del” start-tag

So, in general-template.php, line 112
<label class="hidden" for="s">' . __('Search for:') . '</label>

must be
<div><label class="hidden" for="s">' . __('Search for:') . '</label></div>

and that’s valid.