LU-1347 ptlrpc: makes EXPORT_SYMBOL follows function body

Makes EXPORT_SYMBOL macros immediately follow the function body,
to follow normal Linux kernel coding style.

Signed-off-by: Liu Xuezhao <xuezhao.liu@emc.com>
Change-Id: Ifbebd942033d65382f443edeb9b6fb5100096a47
Reviewed-on: http://review.whamcloud.com/2670
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Peng Tao <bergwolf@gmail.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>