brcmfmac: properly check for bus register errors

The brcmfmac driver ignores any errors on initialization with the
different busses by deferring the initialization to a workqueue and
ignoring all possible errors that might happen.  Fix up all of this by
only allowing the module to load if all bus registering worked properly.

Cc: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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