f2fs: avoid double lock in truncate_blocks

The init_inode_metadata calls truncate_blocks when error is occurred.
The callers holds f2fs_lock_op, so we should not call it again in
truncate_blocks.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Conflicts:
	fs/f2fs/data.c

Change-Id: I72a195956c1a3f13b01b9ee58e4eed04fc706388
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 0cce322..0fdae6f 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -937,7 +937,7 @@
 
 	if (to > inode->i_size) {
 		truncate_pagecache(inode, 0, inode->i_size);
-		truncate_blocks(inode, inode->i_size);
+		truncate_blocks(inode, inode->i_size, true);
 	}
 }