block: remove duplicate include statement in scsi_ioctl.c

scsi/sg.h is included more than once, Remove the one that isn't
necessary.
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/scsi_ioctl.c

@@ -37,8 +37,6 @@ const unsigned char scsi_command_size_tbl[8] =
 };
 EXPORT_SYMBOL(scsi_command_size_tbl);
 
-#include <scsi/sg.h>
-
 static int sg_get_version(int __user *p)
 {
 	static const int sg_version_num = 30527;