Supress error after Xcode 7 update: error: null passed to a callee that...

Supress error after Xcode 7 update: error: null passed to a callee that requires a non-null argument

indra/llwindow/llopenglview-objc.mm

@@ -239,7 +239,11 @@ attributedStringInfo getSegments(NSAttributedString *str)
 	{
 		[glContext setValues:(const GLint*)1 forParameter:NSOpenGLCPSwapInterval];
 	} else {
-		[glContext setValues:(const GLint*)0 forParameter:NSOpenGLCPSwapInterval];
+		// supress this error after move to Xcode 7:
+		// error: null passed to a callee that requires a non-null argument [-Werror,-Wnonnull]
+		// Tried using ObjC 'nonnull' keyword as per SO article but didn't build
+		GLint swapInterval=0;
+		[glContext setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
 	}
 	
     mOldResize = false;