switch-root: not only mkdir the parents but the target dir
switch-root would only mkdir the parents of the mount move directories. With this patch, the mount move target directory is created to make switch-root to an empty root directory work.
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@ -84,7 +84,7 @@ int switch_root(const char *new_root) {
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snprintf(new_mount, sizeof(new_mount), "%s%s", new_root, i);
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char_array_0(new_mount);
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mkdir_parents(new_mount, 0755);
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mkdir_p(new_mount, 0755);
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if ((stat(new_mount, &sb) < 0) ||
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sb.st_dev != new_root_stat.st_dev) {
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