remap_range: Remove check of uptodate flag

read_mapping_folio() returns an ERR_PTR if the folio is not
uptodate, so this check is simply dead code.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

fs/remap_range.c

@@ -148,16 +148,7 @@ static int generic_remap_check_len(struct inode *inode_in,
 /* Read a page's worth of file data into the page cache. */
 static struct folio *vfs_dedupe_get_folio(struct file *file, loff_t pos)
 {
-	struct folio *folio;
-
-	folio = read_mapping_folio(file->f_mapping, pos >> PAGE_SHIFT, file);
-	if (IS_ERR(folio))
-		return folio;
-	if (!folio_test_uptodate(folio)) {
-		folio_put(folio);
-		return ERR_PTR(-EIO);
-	}
-	return folio;
+	return read_mapping_folio(file->f_mapping, pos >> PAGE_SHIFT, file);
 }
 
 /*