[PATCH] MM: Remove [PATCH] invalidate_inode_pages2_range() debug

NFS can handle the case where invalidate_inode_pages2_range() fails, so the
premise behind commit 8258d4a574d3a8c01f0ef68aa26b969398a0e140 is now gone.

Remove the WARN_ON_ONCE() which is causing users grief as we can see from
http://bugzilla.kernel.org/show_bug.cgi?id=7826

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/truncate.c b/mm/truncate.c
index 3262740..5df947d 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -429,7 +429,6 @@
 		pagevec_release(&pvec);
 		cond_resched();
 	}
-	WARN_ON_ONCE(ret);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);