[SPARC64]: Kill swapper_space test in arch/sparc64/mm/tlb.c

It is bogus, plus it breaks the build with
CONFIG_SWAP disabled.

Based upon a patch from Ben Collins (bcollins@debian.org)
Signed-off-by: David S. Miller <davem@redhat.com>

arch/sparc64/mm/tlb.c

@@ -76,7 +76,7 @@ void tlb_batch_add(pte_t *ptep, pte_t orig)
 
 		/* A real file page? */
 		mapping = page_mapping(page);
-		if (!mapping || mapping == &swapper_space)
+		if (!mapping)
 			goto no_cache_flush;
 
 		paddr = (unsigned long) page_address(page);