PM: hibernate: Remove unused stub for saveable_highmem_page()

When saveable_highmem_page() is unused, it prevents kernel builds
with clang, `make W=1` and CONFIG_WERROR=y:

kernel/power/snapshot.c:1369:21: error: unused function 'saveable_highmem_page' [-Werror,-Wunused-function]
 1369 | static inline void *saveable_highmem_page(struct zone *z, unsigned long p)
      |                     ^~~~~~~~~~~~~~~~~~~~~

Fix this by removing unused stub.

See also commit 6863f56 ("kbuild: allow Clang to find unused static
inline functions for W=1 build").

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: andy-shev

kernel/power/snapshot.c

@@ -1365,11 +1365,6 @@ static unsigned int count_highmem_pages(void)
 	}
 	return n;
 }
-#else
-static inline void *saveable_highmem_page(struct zone *z, unsigned long p)
-{
-	return NULL;
-}
 #endif /* CONFIG_HIGHMEM */
 
 /**