Fixed memory management.

This is somewhat pointless because (at least now) the recorder's `init` method will always throw an exception. It avoids an analyser warning, though. See erikdoe#456 for details.

Source/OCMock/OCMockObject.m

@@ -98,10 +98,7 @@ - (instancetype)init
         if(recorder != nil)
         {
             [recorder setMockObject:self];
-#ifndef __clang_analyzer__
-            // see #456 for details
-            return (id)[recorder init];
-#endif
+            return (id)[[recorder retain] init];
         }
         return self;
     }