tests: kms: fix shadowed declaration warning

There is no need to maintain the value in the shadowed variable from
what I can see.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/tests/kms/kms-universal-planes.c b/tests/kms/kms-universal-planes.c
index d8e5fc4..89057bb 100644
--- a/tests/kms/kms-universal-planes.c
+++ b/tests/kms/kms-universal-planes.c
@@ -212,9 +212,9 @@
 		printf("Planes: %u\n", device->num_planes);
 
 		for (i = 0; i < device->num_planes; i++) {
-			struct kms_plane *plane = device->planes[i];
 			const char *type = NULL;
 
+			plane = device->planes[i];
 			switch (plane->type) {
 			case DRM_PLANE_TYPE_OVERLAY:
 				type = "overlay";