How to tell what files on remote repository changed since last git pull?

How to tell what files on remote repository changed since last git pull?

I'm trying to push some code using $git push origin master but I get the
error
! [rejected] master -> master (non-fast-forward)
error: failed to push some refs to 'https://github.com/'
To prevent you from losing history, non-fast-forward updates were rejected
Merge the remote changes (e.g. 'git pull') before pushing again. See the
'Note about fast-forwards' section of 'git push --help' for details.
When I did $ git fetch origin master then $ git diff maser origin/master I
got a list of all the files and changes that were different between the
two repos. However I am only interested in the list of files that have
changed between the remote repository and the last time I did a $ git pull
origin master on my local box.
Is there a way I can do this?