mm: fix mismerge of folio page flag manipulators

I had missed a semantic conflict between commit d389a4a811 ("mm: Add
folio flag manipulation functions") from the folio tree, and commit
eac96c3efd ("mm: filemap: check if THP has hwpoisoned subpage for PMD
page fault") that added a new set of page flags.

My build tests had too many options enabled, which hid this issue.  But
if you didn't have MEMORY_FAILURE or TRANSPARENT_HUGEPAGE enabled, you'd
end up with build errors like this:

  include/linux/page-flags.h:806:29: error: macro "PAGEFLAG_FALSE" requires 2 arguments, but only 1 given
    806 | PAGEFLAG_FALSE(HasHWPoisoned)
        |                             ^

due to the missing lowercase name used for folio function naming.

Fixes: 49f8275c7d ("Merge tag 'folio-5.16' of git://git.infradead.org/users/willy/pagecache")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Reported-by: Yang Shi <shy828301@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/page-flags.h

@@ -803,8 +803,8 @@ PAGEFLAG_FALSE(DoubleMap, double_map)
 PAGEFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND)
 	TESTSCFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND)
 #else
-PAGEFLAG_FALSE(HasHWPoisoned)
-	TESTSCFLAG_FALSE(HasHWPoisoned)
+PAGEFLAG_FALSE(HasHWPoisoned, has_hwpoisoned)
+	TESTSCFLAG_FALSE(HasHWPoisoned, has_hwpoisoned)
 #endif
 
 /*