tic takes too long time to parse corrupted source terminfo

[Hongxu(primary)]

Hi,

    When applying tic on some corrupted source terminfo file, it may take extremely long time to parse.

    This may result from the fact for some file input, inside `_nc_resolve_uses2`, the iteration on `qp` took too much time; meanwhile the use entry keeps unresolved, which finally forces "keepgoing" to be true.

    An sample file input is attached. 

Best Regards,

Hongxu

tic_hang
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