Input: synaptics-rmi4 - fix reversed conditions in enable/disable_irq_wake

These tests are reversed.  A warning should be displayed if an error is
returned, not on success.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>