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unobfuscate follow_up() a bit
really convoluted test in there has grown up during struct mount introduction; what it checks is that we'd reached the root of mount tree.
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@ -722,7 +722,7 @@ int follow_up(struct path *path)
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br_read_lock(&vfsmount_lock);
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parent = mnt->mnt_parent;
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if (&parent->mnt == path->mnt) {
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if (parent == mnt) {
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br_read_unlock(&vfsmount_lock);
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return 0;
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}
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