mmc: wbsd: fix double mmc_free_host() in wbsd_init()

mmc_free_host() has already be called in wbsd_free_mmc(),
remove the mmc_free_host() in error path in wbsd_init().

Fixes: dc5b9b50

 ("mmc: wbsd: fix return value check of mmc_add_host()")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230807124443.3431366-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>