Grow: report correct new chunk size.

When using "--grow --chunk=" to change chunk
size, the old chunksize is reported instead of the new.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

Grow.c

@@ -3286,7 +3286,7 @@ static int reshape_array(char *container, int fd, char *devname,
 				goto release;
 			} else if (verbose >= 0)
 				printf("chunk size for %s set to %d\n",
-				       devname, array.chunk_size);
+				       devname, info->new_chunk);
 		}
 		unfreeze(st);
 		return 0;