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Be sure that the discovered filesystem is not null.
- While scanning for a filesystem on a disk, the klibc utility can return a null string if it not finds a filesystem (e.g. on a container partition), and grepping for a null string either reports true if escaped or hangs grep if not escaped. Both conditions must be avoided in order to report that the kernel supports the filesystem named as the string. Signed-off-by: Marco Amadori <marco.amadori@gmail.com>
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