drm/sti:fix spelling mistake: "compoment" -> "component"

Trivial fix to spelling mistake in DRM_ERROR message
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170513224150.19955-1-colin.king@canonical.com

drivers/gpu/drm/sti/sti_compositor.c

@@ -129,7 +129,7 @@ static int sti_compositor_bind(struct device *dev,
 			}
 			break;
 		default:
-			DRM_ERROR("Unknown subdev compoment type\n");
+			DRM_ERROR("Unknown subdev component type\n");
 			return 1;
 		}