staging: wfx: do not display functions names in logs

It is not necessary to prefix error logs with the function name when an
error message is unique in the code.

Note this patch still prefixes the message 'received event for
non-existent vif' with the function name since it is used several
times.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20220113085524.1110708-26-Jerome.Pouiller@silabs.com


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