[GFS2] remove gfs2_dev_iops

struct inode_operations gfs2_dev_iops is always the same as gfs2_file_iops,
since Jan 2006, when GFS2 merged into mainstream kernel.

So one of them could be removed.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 810ff02..7b9f31e 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -149,7 +149,7 @@
 	} else if (S_ISLNK(mode)) {
 		inode->i_op = &gfs2_symlink_iops;
 	} else {
-		inode->i_op = &gfs2_dev_iops;
+		inode->i_op = &gfs2_file_iops;
 	}
 
 	unlock_new_inode(inode);