i2c: pm_smbus: Make the I2C block read command read-only

It did have write capability, but the manual says the behavior
with write enabled is undefined.  So just set an error in this
case.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1534796770-10295-4-git-send-email-minyard@acm.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 file changed