here is the way to apply

# get Gnuradio sources (you probably already did this)
git clone https://github.com/gnuradio/gnuradio.git

cd gnuradio
git remote add pinky https://github.com/pinkavaj/gnuradio.git
git fetch -p --all

# get all up-to-data, I suppose You does not commit to upstream
# branches
git checkout master
git pull
git checkout next
git pull

# get and swich into the branch with fixes
git checkout -b top_blk-fix-03 pinky/top_blk-fix-03

# optionaly you can rebase on top of the latest gnuradio
git rebase master

# or next if you need even more recent stuff
git rebase next

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git checkout next doesn't work