drm/atomic-helper: Fix typo

Fix "esay-to-use" to "easy-to-use" typo.
Acked-by: NNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171012140616.9002-1-thierry.reding@gmail.com

drivers/gpu/drm/drm_atomic_helper.c

@@ -1704,7 +1704,7 @@ crtc_or_fake_commit(struct drm_atomic_state *state, struct drm_crtc *crtc)
  * drm_atomic_helper_commit_cleanup_done().
  *
  * This is all implemented by in drm_atomic_helper_commit(), giving drivers a
- * complete and esay-to-use default implementation of the atomic_commit() hook.
+ * complete and easy-to-use default implementation of the atomic_commit() hook.
  *
  * The tracking of asynchronously executed and still pending commits is done
  * using the core structure &drm_crtc_commit.