The definition of IS_ERR() already applies the unlikely() notation when
checking the error status of the passed pointer. For this reason there is no
need to have the same notation outside of IS_ERR() itself.

Clean up code by removing redundant notation.
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Link: https://lore.kernel.org/r/20201210085321.18693-1-a@unstable.ccSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>