hex_dump: Convert argument to long
hex_dump: Convert argument to long

To eliminate format problem

 | util.c:60:10: error: format ‘%lx’ expects argument of
 | type ‘long unsigned int’, but argument 2 has type
 | ‘unsigned char *’ [-Werror=format]

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>

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