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

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: mmc: moxart: 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 goto error path which will call mmc_free_host().

References

• https://git.kernel.org/stable/c/a4c765f5d8e58138cff69f1510b2e8942ec37022
• https://git.kernel.org/stable/c/a94d466f31a5201995d39bc1208e2c09ab04f0bf
• https://git.kernel.org/stable/c/c7e9a2059fb943fc3c3fa12261518fd72a0fc136
• https://git.kernel.org/stable/c/b174f2b36c638fc7737df6c8aac1889a646be98f
• https://git.kernel.org/stable/c/7c3b301ca8b0cab392c71da8fcdfa499074f8e97
• https://git.kernel.org/stable/c/f0502fe86a2db2336c9498d2de3e97f22dcf85ae
• https://git.kernel.org/stable/c/8f8bb62c7c5c833758ef1563fe738afd579c3efe
• https://git.kernel.org/stable/c/40aa73c70e8a5706f9cbe01409a5e51cc0f1750e
• https://git.kernel.org/stable/c/0ca18d09c744fb030ae9bc5836c3e357e0237dea