[patch] drm: atmel-hlcdc: fix a NULL check

[Dan Carpenter]

If kmalloc() returned NULL we would end up dereferencing "state" a
couple lines later.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c 
b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
index 8df0aaf..867069b 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -415,8 +415,9 @@ atmel_hlcdc_crtc_duplicate_state(struct drm_crtc *crtc)
                return NULL;

        state = kmalloc(sizeof(*state), GFP_KERNEL);
-       if (state)
-               __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
+       if (!state)
+               return NULL;
+       __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);

        cur = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
        state->output_mode = cur->output_mode;