Fix return type of avatar file

[Pytal]

The implementations return either ISimpleFile or InMemoryFile

• server/lib/private/Avatar/UserAvatar.php

  Lines 235 to 246 in 213e75b

  	/**
  	* Returns the avatar for an user.
  	*
  	* If there is no avatar file yet, one is generated.
  	*
  	* @param int $size
  	* @return ISimpleFile
  	* @throws NotFoundException
  	* @throws \OCP\Files\NotPermittedException
  	* @throws \OCP\PreConditionNotMetException
  	*/
  	public function getFile($size) {

• server/lib/private/Avatar/PlaceholderAvatar.php

  Lines 105 to 116 in 213e75b

  	/**
  	* Returns the avatar for an user.
  	*
  	* If there is no avatar file yet, one is generated.
  	*
  	* @param int $size
  	* @return ISimpleFile
  	* @throws NotFoundException
  	* @throws \OCP\Files\NotPermittedException
  	* @throws \OCP\PreConditionNotMetException
  	*/
  	public function getFile($size) {

• server/lib/private/Avatar/GuestAvatar.php

  Lines 89 to 94 in 213e75b

  	/**
  	* Generates an avatar for the guest.
  	*
  	* @param int $size The desired image size.
  	* @return InMemoryFile
  	*/

[icewind1991]

other than the change already mentioned by @come-nc

[Pytal]

/backport to stable23

[Pytal]

/backport to stable22

[Pytal]

/backport to stable21