sparc: mm: return true,false in kern_addr_valid()

This function's return type is bool and returns both true/false and 0/1.
This fixes the following coccicheck warning:

arch/sparc/mm/init_64.c:1652:9-10: WARNING: return of 0/1 in function
'kern_addr_valid' with return type bool
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/mm/init_64.c

@@ -1674,29 +1674,29 @@ bool kern_addr_valid(unsigned long addr)
 
 	pgd = pgd_offset_k(addr);
 	if (pgd_none(*pgd))
-		return 0;
+		return false;
 
 	p4d = p4d_offset(pgd, addr);
 	if (p4d_none(*p4d))
-		return 0;
+		return false;
 
 	pud = pud_offset(p4d, addr);
 	if (pud_none(*pud))
-		return 0;
+		return false;
 
 	if (pud_large(*pud))
 		return pfn_valid(pud_pfn(*pud));
 
 	pmd = pmd_offset(pud, addr);
 	if (pmd_none(*pmd))
-		return 0;
+		return false;
 
 	if (pmd_large(*pmd))
 		return pfn_valid(pmd_pfn(*pmd));
 
 	pte = pte_offset_kernel(pmd, addr);
 	if (pte_none(*pte))
-		return 0;
+		return false;
 
 	return pfn_valid(pte_pfn(*pte));
 }