staging: wfx: improve error message on unexpected confirmation

When driver receives an unexpected answer from the device, it shows
"unsupported HIF ID". That message does not represent the real error.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191217161318.31402-15-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>