resources: tidy __request_region()

No functional change.  Just return NULL for kzalloc failure immediately,
rather than wrapping the whole function body in the body of an "if".
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/resource.c

@@ -630,7 +630,9 @@ struct resource * __request_region(struct resource *parent,
 {
 	struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
 
-	if (res) {
+	if (!res)
+		return NULL;
+
 	res->name = name;
 	res->start = start;
 	res->end = start + n - 1;
@@ -656,7 +658,6 @@ struct resource * __request_region(struct resource *parent,
 		break;
 	}
 	write_unlock(&resource_lock);
-	}
 	return res;
 }
 EXPORT_SYMBOL(__request_region);