commit 9e48854c upstream.

Instead of checking if num_encoders is zero, it is being assigned 0.
Convert the assignment to a check.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>