mmc: rtsx_pci: fix return value check of mmc_add_host()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: mmc: rtsx_pci: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, the memory that allocated in mmc_alloc_host() will be leaked and it will lead a kernel crash because of deleting not added device in the remove path. So fix this by checking the return value and calling mmc_free_host() in the error path, beside, runtime PM also needs be disabled.

References

• https://git.kernel.org/stable/c/30dc645461dfc63e52b3af8ee4a98e17bf14bacf
• https://git.kernel.org/stable/c/5cd4e04eccaec140da6fa04db056a76282ee6852
• https://git.kernel.org/stable/c/ffa9b2a79e3e959683efbad3f6db937eca9d38f5
• https://git.kernel.org/stable/c/0c87db77423a282b3b38b8a6daf057b822680516