block: Remove check of PageError

If read_mapping_page() sees a page with PageError set, it returns a
PTR_ERR().  Checking PageError again is simply dead code.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

block/partitions/core.c

@@ -716,14 +716,10 @@ void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
 			(pgoff_t)(n >> (PAGE_SHIFT - 9)), NULL);
 	if (IS_ERR(page))
 		goto out;
-	if (PageError(page))
-		goto out_put_page;
 
 	p->v = page;
 	return (unsigned char *)page_address(page) +
 			((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << SECTOR_SHIFT);
-out_put_page:
-	put_page(page);
 out:
 	p->v = NULL;
 	return NULL;