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
parameters "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: I83326b50860bdfeb4cd31509f99f7ab1b6a8ab13
Signed-off-by: Hongchao Zhang <hongchao.zhang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1401
Tested-by: Hudson
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>