mm,hwpoison: fix printing of page flags

Format %pG expects a lower case 'p' in order to print the flags.
Fix it.

Link: https://lkml.kernel.org/r/20210108085202.4506-1-osalvador@suse.de


Fixes: 8295d535 ("mm,hwpoison: refactor get_any_page")
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>