pagevec: Use xa_mark_t

Removes sparse warnings.

Signed-off-by: Matthew Wilcox <willy@infradead.org>

fs/gfs2/aops.c

@@ -366,7 +366,7 @@ static int gfs2_write_cache_jdata(struct address_space *mapping,
 	pgoff_t done_index;
 	int cycled;
 	int range_whole = 0;
-	int tag;
+	xa_mark_t tag;
 
 	pagevec_init(&pvec);
 	if (wbc->range_cyclic) {