inode->i_op is never NULL

We used to have rather schizophrenic set of checks for NULL ->i_op even
though it had been eliminated years ago.  You'd need to go out of your
way to set it to NULL explicitly _and_ a bunch of code would die on
such inodes anyway.  After killing two remaining places that still
did that bogosity, all that crap can go away.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/open.c b/fs/open.c
index 1cd7d40..d882fd2 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -412,7 +412,7 @@
 	if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
 		goto out_fput;
 
-	if (inode->i_op && inode->i_op->fallocate)
+	if (inode->i_op->fallocate)
 		ret = inode->i_op->fallocate(inode, mode, offset, len);
 	else
 		ret = -EOPNOTSUPP;