hush: fix a case when redirect to a closed fd #1 is not restoring (closing) it

hush: fix a case when redirect to a closed fd #1 is not restoring (closing) it

function                                             old     new   delta
setup_redirects                                      200     245     +45
append_squirrel                                        -      41     +41
save_fds_on_redirect                                 256     221     -35
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(add/remove: 1/0 grow/shrink: 1/1 up/down: 86/-35)             Total: 51 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>