TEST_NLATTR_OBJECT and TEST_NLATTR_ARRAY fault when sizeof(obj) - 1 > DEFAULT_STRLEN

[JingPiao Chen]

when sizeof(obj) - 1 > DEFAULT_STRLEN, we print all string,
but strace print "STR"..., so the test fault.
This appear when I test packet_diag_msg PACKET_DIAG_MCLIST.

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JingPiao Chen