mmc: core: add devm_mmc_alloc_host (5.10.y)

Hi Sasha,

The 5.10.y kernel backported commit 80df83c2c57e ("mmc: core: add devm_mmc_alloc_host") but not the fix for it.

71d04535e853 ("mmc: core: fix return value check in devm_mmc_alloc_host()")

The 6.6.y kernel was released with both commits so it's not affected and none of the other stable trees include the buggy commit so they're not affected either. Only 5.10.y needs to be fixed.

regards, dan carpenter