serial: sh-sci: Use dev_err_probe()

Use the dev_err_probe() helper to streamline error handling.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/5c4dd8df1f8d0d14786f26ee80b77f3eb8e06cd5.1639663832.git.geert+renesas@glider.be


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>