i2c: rcar: fix error code in probe()

commit 37a672be upstream.

Return an error code if devm_reset_control_get_exclusive() fails.
The current code returns success.

Fixes: 0e864b55 ("i2c: rcar: reset controller is mandatory for Gen3+")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>