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CID 161288: Null pointer dereferences (REVERSE_INULL) Ensure physpath != NULL before the strcmp. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov> Closes #5974