travis: pass the proper branch to compile_test.py

.travis.yml

@@ -30,6 +30,7 @@ install:
         sudo apt-get install $(./dist/tools/travis-scripts/get-pkg-list.py)
     - git config --global user.email "travis@example.com"
     - git config --global user.name "Travis CI"
+    - test "$TRAVIS_BRANCH" = "master" || git fetch origin $TRAVIS_BRANCH:$TRAVIS_BRANCH
 
 script:
     - ./dist/tools/travis-scripts/build_and_test.sh

dist/tools/travis-scripts/build_and_test.sh

@@ -70,5 +70,5 @@ then
         #   resolved:
         #   - make -C ./tests/unittests all test BOARD=qemu-i386 || exit
     fi
-    ./dist/tools/compile_test/compile_test.py master
+    ./dist/tools/compile_test/compile_test.py $TRAVIS_BRANCH
 fi