Cleanup.

include/bx/error.h

@@ -72,11 +72,16 @@ namespace bx
 			return result;
 		}
 
-		bool operator==(ErrorResult _rhs) const
+		bool operator==(const ErrorResult& _rhs) const
 		{
 			return _rhs.code == m_code;
 		}
 
+		bool operator!=(const ErrorResult& _rhs) const
+		{
+			return _rhs.code != m_code;
+		}
+
 	private:
 		const char* m_msg;
 		uint32_t    m_code;