regmap: Remove superfluous check for !config in __regmap_init()

[ Upstream commit 5c36b86d ]

The first thing __regmap_init() do is check if config is non-NULL,
so there is no need to check for this again later.

Fixes: d77e7456 ("regmap: Add bulk read/write callbacks into regmap_config")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/a154d9db0f290dda96b48bd817eb743773e846e1.1755090330.git.geert+renesas@glider.be


Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>