[wp-trac] [WordPress Trac] #38984: REST API: Fix incorrect calls to `rest_sanitize_value_from_schema`

[WordPress Trac]

#38984: REST API: Fix incorrect calls to `rest_sanitize_value_from_schema`
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 Reporter:  jnylen0       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.7
Component:  REST API      |    Version:  trunk
 Severity:  normal        |   Keywords:  has-patch
  Focuses:                |
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 Two instances in `WP_REST_Users_Controller` where we are passing
 `$request` instead of `$args`.  This allows some minor weirdness:

 `POST /wp/v2/users?username=abcd&password=efgh&type=array`

 A user will be created with the username and password set to `Array`
 because `$request['array']` is interpreted as a type argument.

 One more incorrect call in `rest_sanitize_request_arg` where we are
 calling the function with a nonexistent third argument.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38984>
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