The main intention to ask this question is to see what your attitude TOWARDS feedback is and how you react to it. The main point here is to let the interviewer know that you are ALWAYS open to constructive feedback. You should not show yourself as a stubborn or ignorant person who is not capable of taking any input for your growth.

Sample ANSWER:

I am always enthusiastic about learning NEW THINGS and during the process, I might tend to make mistakes. If someone provides me with constructive criticism, I am always open to it and I will work on correcting myself and learn from my mistakes. This would help me grow and move forward. If the feedback is negative, then I am mature enough to ignore the feedback and continue working on doing my job to the best of my capabilities without dampening my spirit.