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So far negative values were denoting files, positive values denoting directories. We should prefer a less error prone method. Redefine virtual_ftype_t to contain only positive values and replace checks for negativ or positive values with inline functions virt_ftype_isfile() and virt_ftype_isdir(). Drop outdcated comments referring to numerical virtual_ftype_t values. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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