iwlwifi: mvm: don't get address of mvm->fwrt just to dereference as a pointer

The mvm->fwrt element is not a pointer, but an instance of the
structure, so we should access its elements with a dot-notation
instead of getting the address and dereferencing it as a pointer.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211024181719.ce6841093681.I09634a0aa845a0256e79c7895154d9ac35bc26be@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>