Fix GH-17145: DOM memory leak

Because the use of RETURN instead of RETVAL, the freeing code could not
be executed. This only is triggerable if the content of the attribute is
mixed t

Fix GH-17145: DOM memory leak

Because the use of RETURN instead of RETVAL, the freeing code could not
be executed. This only is triggerable if the content of the attribute is
mixed text and entities, so it wasn't noticed earlier.

Closes GH-17147.

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