UBI: fix IS_ERR test

Author: Julien Brunel <brunel@diku.dk>

In case of error, the function add_volume returns an ERR pointer. The
result of IS_ERR, which is supposed to be used in a test as it is, is
here checked to be less than zero, which seems odd. We suggest to
replace this test by a simple IS_ERR test.

A simplified version of the semantic match that finds this problem is
as follows:
(http://www.emn.fr/x-info/coccinelle/)

// 
@def0@
expression x;
position p0;
@@
x@p0 = add_volume(...)

@protected@
expression def0.x,E;
position def0.p0;
position p;
statement S;
@@
x@p0
... when != x = E
if (!IS_ERR(x) && ...) {<... x@p ...>} else S

@unprotected@
expression def0.x,E;
identifier fld;
position def0.p0;
position p != protected.p;
@@
x@p0
... when != x = E
* x@p->fld
// 

Signed-off-by:  Julien Brunel 
Signed-off-by:  Julia Lawall 
Signed-off-by: Artem Bityutskiy 

---
 drivers/mtd/ubi/scan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 967bb44..4f2daa5 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -387,7 +387,7 @@ int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
 		pnum, vol_id, lnum, ec, sqnum, bitflips);
 
 	sv = add_volume(si, vol_id, pnum, vid_hdr);
-	if (IS_ERR(sv) < 0)
+	if (IS_ERR(sv))
 		return PTR_ERR(sv);
 
 	if (si->max_sqnum < sqnum)