Avoid nil ptr panic in GetAttr() #300
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This PR removes the chance of the nil ptr panic in #298. Before this change, the only way to avoid a panic is for the
if file == nil || code == fuse.ENOSYS || code == fuse.EBADFcondition to be true, since only then wouldfibe set to something non-nil. So it's not really a condition anymore, and 47211c2 has made it obsolete anyway.