s/Tst_count/tst_count/ to avoid CamelCase

when using latest checkpatch.pl, CamelCase variables are not encouraged,
this patch does a batch update to replace all var `Tst_count` with
`tst_count`.

Signed-off-by: Caspar Zhang <caspar@casparzhang.com>
Acked-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
syscalls/madvise: code cleanup

Just a code cleanup for syscalls/madvise01-04 cases.

Signed-off-by: Caspar Zhang <caspar@casparzhang.com>
Reviewed-by: Wanlong Gao<gaowanlong@cn.fujitsu.com>
syscalls/madvise02: fix madvise case due to kernel change

since kernel commit 1998cc0 (after kernel-3.8 released),
madvise(MADV_WILLNEED) to anonymous memory doesn't return -EBADF now, as
now we support swap prefetch. Thus the 5th testcase in madvise02 will
not pass. This patch fixes this by adding a tst_kvercmp() condition, and
will give a pass if kernel is >=3.9 (including the RCs).

Signed-off-by: Caspar Zhang <caspar@casparzhang.com>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Zhouping Liu <zliu@redhat.com>