truncate: drop 'oldsize' truncate_pagecache() parameter

truncate_pagecache() doesn't care about old size since commit
cedabed49b39 ("vfs: Fix vmtruncate() regression").  Let's drop it.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 977da0e..e51e581 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1582,7 +1582,7 @@
 		unlock_page(page);
 
 		if (pos + len > i_size_read(inode))
-			truncate_pagecache(inode, pos + len, i_size_read(inode));
+			truncate_pagecache(inode, i_size_read(inode));
 
 		page_cache_release(page);
 		page = NULL;
@@ -1618,7 +1618,7 @@
 		loff_t		to = pos + len;
 
 		if (to > isize) {
-			truncate_pagecache(inode, to, isize);
+			truncate_pagecache(inode, isize);
 			xfs_vm_kill_delalloc_range(inode, isize, to);
 		}
 	}