[U-Boot] hush variable expansion & quoting

[Henrik Nordström]

Quoting is broken (ignored/lost) when there is variable expansions

    # test "a b" = c; echo $?
    1
    # v="a b"
    # test "$v" = c; echo $?
    0
    # echo "a    b"
    a    b
    # v="a    b"
    # echo "$v"
    a b

Regards
Henrik

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