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As reported by coverity tool:


1. libnftnl-1.0.6/src/expr/limit.c:262: unreachable: This code cannot be reached: "return "unknown";".
#   260|   		return "bytes";
#   261|   	}
#   262|-> 	return "unknown";
#   263|   }
#   264|

Fixed by the following upstream commit:

commit e381cd99e9eb0e9519a976c8288f6b9e051ada3a
Author: Phil Sutter <phil>
Date:   Fri Aug 12 01:33:36 2016 +0200

    expr/limit: Drop unreachable code in limit_to_type()
    
    The function returns from inside the switch() in any case, so the final
    return statement is never reached.
    
    Fixes: 7769cbd9dfe69 ("expr: limit: add per-byte limiting support")
    Signed-off-by: Phil Sutter <phil>
    Signed-off-by: Pablo Neira Ayuso <pablo>

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2007