fs/btrfs: drop if around WARN_ON

Just use WARN_ON rather than an if containing only WARN_ON(1).

A simplified version of the semantic patch that makes this transformation
is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@
- if (e) WARN_ON(1);
+ WARN_ON(e);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6dca345fd1b6..e8733fab2739 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1675,8 +1675,7 @@ static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
                               struct extent_state **cached_state)
 {
-        if ((end & (PAGE_CACHE_SIZE - 1)) == 0)
-                WARN_ON(1);
+        WARN_ON((end & (PAGE_CACHE_SIZE - 1)) == 0);
         return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end,
                                    cached_state, GFP_NOFS);
 }