ovl: opaque cleanup
oe->opaque is set for
a) whiteouts
b) directories having the "trusted.overlay.opaque" xattr
Case b can be simplified, since setting the xattr always implies setting
oe->opaque. Also once set, the opaque flag is never cleared.
Don't need to set opaque flag for non-directories.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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