[SCSI] sg: fix leak when dio setup fails

when the sg driver is unable to setup direct IO, free that scatter
gather list prior to falling back to indirect IO

Further to this thread started by Bryan Holty:
http://marc.theaimsgroup.com/?l=linux-scsi&m=114306885116728&w=2

Here is the reworked patch again. This time it has been
tested with a program provided by Bryan.
Signed-off-by: NDouglas Gilbert <dougg@torque.net>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/sg.c

@@ -1799,8 +1799,10 @@ sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
 	res = st_map_user_pages(schp->buffer, mx_sc_elems,
 				(unsigned long)hp->dxferp, dxfer_len, 
 				(SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
-	if (res <= 0)
+	if (res <= 0) {
+		sg_remove_scat(schp);
 		return 1;
+	}
 	schp->k_use_sg = res;
 	schp->dio_in_use = 1;
 	hp->info |= SG_INFO_DIRECT_IO;