ocfs2: delete unnecessary checks before brelse()

brelse() tests whether its argument is NULL and then returns immediately.
Thus the tests around the shown calls are not needed.

This issue was detected by using the Coccinelle software.

Link: http://lkml.kernel.org/r/55cde320-394b-f985-56ce-1a2abea782aa@web.deSigned-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/dlmglue.c

@@ -2508,9 +2508,7 @@ int ocfs2_inode_lock_full_nested(struct inode *inode,
 			ocfs2_inode_unlock(inode, ex);
 	}
 
-	if (local_bh)
 	brelse(local_bh);
-
 	return status;
 }
 
@@ -2593,7 +2591,6 @@ int ocfs2_inode_lock_atime(struct inode *inode,
 		*level = 1;
 		if (ocfs2_should_update_atime(inode, vfsmnt))
 			ocfs2_update_inode_atime(inode, bh);
-		if (bh)
 		brelse(bh);
 	} else
 		*level = 0;

fs/ocfs2/extent_map.c

@@ -590,7 +590,6 @@ int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
 			*extent_flags = rec->e_flags;
 	}
 out:
-	if (eb_bh)
 	brelse(eb_bh);
 	return ret;
 }