gfs2: remove the unused gfs2_stuffed_write_end function

This function was overlooked when the write_begin and write_end address space
operations were removed as part of gfs2's iomap conversion.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/aops.h

@@ -9,9 +9,6 @@
 #include "incore.h"
 
 extern int stuffed_readpage(struct gfs2_inode *ip, struct page *page);
-extern int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
-				  loff_t pos, unsigned copied,
-				  struct page *page);
 extern void adjust_fs_space(struct inode *inode);
 extern void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
 				   unsigned int from, unsigned int len);