Always install valgrind via the apt addon.

.travis.yml

@@ -27,6 +27,7 @@ addons:
     - libssh2-1-dev
     - openssh-client
     - openssh-server
+    - valgrind
 
 sudo: false
 
@@ -62,7 +63,6 @@ script:
 
 # Run Tests
 after_success:
- - if [ "$TRAVIS_OS_NAME" = "linux" -a -n "$VALGRIND" ]; then sudo apt-get -qq install valgrind; fi
  - if [ "$TRAVIS_OS_NAME" = "linux" -a -n "$VALGRIND" ]; then valgrind --leak-check=full --show-reachable=yes --suppressions=./libgit2_clar.supp _build/libgit2_clar -ionline; fi
 
 # Only watch the development and master branches