BUG/MINOR: cli: Fix a crash when passing a negative or too large value to "show fd"

This bug is present since 7a4a0ac71d ("MINOR: cli: add a new "show fd"
command").

This should be backported to 1.8.

Signed-off-by: Aurélien Nephtali <aurelien.nephtali@corp.ovh.com>
1 file changed