modetest: fix typo

Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rob Clark <rob@ti.com>
diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index 819724a..223adc4 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -770,7 +770,7 @@
 			kms_bo_get_prop(plane_bo, KMS_HANDLE, &handles[1]);
 			pitches[2] = p->w / 2;
 			offsets[2] = offsets[1] + (p->w * p->h) / 4;
-			kms_bo_get_prop(plane_bo, KMS_HANDLE, &handles[1]);
+			kms_bo_get_prop(plane_bo, KMS_HANDLE, &handles[2]);
 
 			fill420(virtual, virtual+offsets[1], virtual+offsets[2],
 					1, 0, p->w, p->h, pitches[0]);