LU-610 fix the wrong data type in find_value_cmp

LU-610 fix the wrong data type in find_value_cmp

in function find_value_cmp (lustre/utils/liblustreapi.c), the data type for
paramters "file" and "limit" is converted from "unsigned long long" type into
"unsigned int" type by mistake, and the file size should be defined as
"unsigned long long" type too.

Change-Id: Icacebccdf55d8ad761390bb03aa9aab0fdc67131
Signed-off-by: Hongchao Zhang <hongchao.zhang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1289
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>