net: sfp: use %pe for printing errors

Convert sfp to use %pe for printing error codes, which can print them
as errno symbols rather than numbers.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/E1nOyEN-00BuuE-OB@rmk-PC.armlinux.org.uk


Signed-off-by: Jakub Kicinski <kuba@kernel.org>