Fix object initialization

Summary: self should be assigned to result of [super init]

Reviewed By: shergin

Differential Revision: D15295275

fbshipit-source-id: 722ae9ad3f9fb8ee3a86892bfb5b2a4cb7b8c708

Libraries/SurfaceBackedComponent/RCTSurfaceBackedComponentState.mm

@@ -18,7 +18,7 @@
 
 - (instancetype)initWithSurface:(RCTSurface *)surface
 {
-  if (self == [super init]) {
+  if (self = [super init]) {
     _surface = surface;
   }