ash: fix "shift BIGNUM" and "read with no variable name" bugs.
 omg. hush testsuite helps to find bugs in ash! what next?

function                                             old     new   delta
static.arg_REPLY                                       -       8      +8
readcmd                                             1023    1021      -2
shiftcmd                                             129     125      -4
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(add/remove: 1/0 grow/shrink: 0/2 up/down: 8/-6)                Total: 2 bytes

1 file changed