egl/wayland: plug memory leak in drm_handle_device()

As we fail to open the node, we leak the node/device name.

v2: Log and then free() (Eric)

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
(cherry picked from commit ce74a7bb)