drm/vc4: fix spelling mistake: "dimesions" -> "dimensions"

Trivial fix to spelling mistake in DRM_ERROR message and split
over two lines to clean up a "line over 80 characters" checkpatch
warning.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NEric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170514170016.6802-1-colin.king@canonical.com

drivers/gpu/drm/vc4/vc4_validate.c

@@ -172,7 +172,8 @@ vc4_check_tex_size(struct vc4_exec_info *exec, struct drm_gem_cma_object *fbo,
 	 * our math.
 	 */
 	if (width > 4096 || height > 4096) {
-		DRM_ERROR("Surface dimesions (%d,%d) too large", width, height);
+		DRM_ERROR("Surface dimensions (%d,%d) too large",
+			  width, height);
 		return false;
 	}