Dmitry V. Levin
08b8e9130e
Given that ERRNO_IS_NOT_SUPPORTED() also matches positive values, make sure this macro is not called with arguments that do not have errno semantics. In this case the arguments passed to ERRNO_IS_NOT_SUPPORTED() are the values returned by btrfs_subvol_make_fd() which is not expected to return any positive values, but let's be consistent anyway and move ERRNO_IS_NOT_SUPPORTED() invocations to the branches where the return values are known to be negative.
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