When changing the RandR provider property, if the property does not
already exists, it is created.
In case of error, however, it doesn't get freed, leading to a leak of
the allocated property.
Make sure to free the RandR property in case of error if was to be
added.
Found by OpenScanHub.
Fixes: 3c3a4b767 - randr: Check for overflow in RRChangeProviderProperty()
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2035>
c34f59ee15