UBIFS: use ERR_CAST
Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)). The former makes more clear what is the purpose of the operation, which otherwise looks like a no-op. Signed-off-by: NJulia Lawall <julia@diku.dk> Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
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