[SCSI] sg: remove unnecessary check

coverity spotted this (cid #758).  All callers dereference sfp, so we dont
need this check.  In addition to this, we dereference it earlier in the
function.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Acked-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 0c691a6..85d3894 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1842,7 +1842,7 @@
 	int blk_size = buff_size;
 	struct page *p = NULL;
 
-	if ((blk_size < 0) || (!sfp))
+	if (blk_size < 0)
 		return -EFAULT;
 	if (0 == blk_size)
 		++blk_size;	/* don't know why */