fs/reiserfs: use an IS_ERR test rather than a NULL test
fs/reiserfs: use an IS_ERR test rather than a NULL test

In case of error, the function open_xa_dir returns an ERR pointer, but
never returns a NULL pointer.  So a NULL test that comes after an IS_ERR
test should be deleted.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@match_bad_null_test@
expression x, E;
statement S1,S2;
@@
x = open_xa_dir(...)
... when != x = E
(
*  if (x == NULL && ...) S1 else S2
|
*  if (x == NULL || ...) S1 else S2
)
// </smpl>

Signed-off-by: Julien Brunel <3a466b0ffa89e080ef6a24bb3855b3f0c43a236e@diku.dk>
Signed-off-by: Julia Lawall <b43b0ad1e8108e7ab870d7a54feac93ae8b8600e@diku.dk>
Cc: Jeff Mahoney <5459ed423adecc5a7fe2249dd619058acc25c497@suse.com>
Cc: Jan Kara <596727c8a0ea4db3ba2ceceedccbacd3d7b371b8@ucw.cz>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs