x86/mm/pat: Simplify the free_memtype() control flow

Simplify/streamline the quirky handling of the pat_pagerange_is_ram() logic,
and get rid of the 'err' local variable.
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/mm/pat.c

@@ -656,7 +656,6 @@ int reserve_memtype(u64 start, u64 end, enum page_cache_mode req_type,
 
 int free_memtype(u64 start, u64 end)
 {
-	int err = -EINVAL;
 	int is_range_ram;
 	struct memtype *entry;
 
@@ -671,14 +670,10 @@ int free_memtype(u64 start, u64 end)
 		return 0;
 
 	is_range_ram = pat_pagerange_is_ram(start, end);
-	if (is_range_ram == 1) {
-
-		err = free_ram_pages_type(start, end);
-
-		return err;
-	} else if (is_range_ram < 0) {
+	if (is_range_ram == 1)
+		return free_ram_pages_type(start, end);
+	if (is_range_ram < 0)
 		return -EINVAL;
-	}
 
 	spin_lock(&memtype_lock);
 	entry = memtype_erase(start, end);