nilfs2: remove redundant pointer sbufs

Pointer sbufs is being assigned a value but it's not being used later on.
The pointer is redundant and can be removed.  Cleans up scan-build static
analysis warning:

fs/nilfs2/page.c:203:8: warning: Although the value stored to 'sbufs'
is used in the enclosing expression, the value is never actually read
from 'sbufs' [deadcode.DeadStores]
        sbh = sbufs = page_buffers(src);

Link: https://lkml.kernel.org/r/20211211180955.550380-1-colin.i.king@gmail.com
Link: https://lkml.kernel.org/r/1640712476-15136-1-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

fs/nilfs2/page.c

@@ -195,12 +195,12 @@ void nilfs_page_bug(struct page *page)
  */
 static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
 {
-	struct buffer_head *dbh, *dbufs, *sbh, *sbufs;
+	struct buffer_head *dbh, *dbufs, *sbh;
 	unsigned long mask = NILFS_BUFFER_INHERENT_BITS;
 
 	BUG_ON(PageWriteback(dst));
 
-	sbh = sbufs = page_buffers(src);
+	sbh = page_buffers(src);
 	if (!page_has_buffers(dst))
 		create_empty_buffers(dst, sbh->b_size, 0);