CVE-2023-52531: wifi: iwlwifi: mvm: Fix a memory corruption issue

In the Linux kernel, the following vulnerability has been resolved:

wifi: iwlwifi: mvm: Fix a memory corruption issue

A few lines above, space is kzalloc()'ed for: sizeof(struct iwlnvmdata) + sizeof(struct ieee80211channel) + sizeof(struct ieee80211rate)

'mvm->nvmdata' is a 'struct iwlnvmdata', so it is fine.

At the end of this structure, there is the 'channels' flex array. Each element is of type 'struct ieee80211channel'. So only 1 element is allocated in this array.

When doing: mvm->nvmdata->bands[0].channels = mvm->nvmdata->channels; We point at the first element of the 'channels' flex array. So this is fine.

However, when doing: mvm->nvmdata->bands[0].bitrates = (void )((u8 )mvm->nvmdata->channels + 1); because of the "(u8 )" cast, we add only 1 to the address of the beginning of the flex array.

It is likely that we want point at the 'struct ieee80211rate' allocated just after.

Remove the spurious casting so that the pointer arithmetic works as expected.