You need to review the changes in Gerrit before merging them into the master. The changes can be synchronized that have occurred in the master. Use the following command within the branch that you have been working on.
$ git pull --rebase origin master
The above command will fetch the changes or commits from the remote branch and rebase the commits on top of the master.
When you are done with the changes and rebased the commits, you can push your change set to Gerrit for review.
Git pull --rebase is often used when changes do not deserve a separate branch.
Git pull is a combination of git fetch and git merge; where as git pull --rebase is a combination of git fetch and git rebase.
First, run the command as git pull origin master as shown in the following screenshot.
Now use the command as git rebase master to rebase the commits as shown in the following screenshot.