USB: host: ehci-npcm7xx: Fix some error codes in probe

We accidentally return 1 instead of negative error codes.

Fixes: df44831e ("USB host: Add USB ehci support for nuvoton npcm7xx platform")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Avi Fishman <AviFishman70@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>