travis: anchor grep for astyle

Should not pick up .cmake files (just .c files)

Author: 0xc0170

.travis.yml

@@ -129,7 +129,7 @@ matrix:
       - astyle --version
       script:
         # only changed files this time
-        git diff --name-only --diff-filter=d $TRAVIS_BRANCH | grep '.*\.\(h\|c\|hpp\|cpp\)' | fgrep -v -f .astyleignore | xargs -n 100 -I {} bash -c "astyle -n --options=.astylerc \"{}\"" > astyle-files-changed.out;
+        git diff --name-only --diff-filter=d $TRAVIS_BRANCH | grep '.*\.\(h\|c\|hpp\|cpp\)$' | fgrep -v -f .astyleignore | xargs -n 100 -I {} bash -c "astyle -n --options=.astylerc \"{}\"" > astyle-files-changed.out;
           if [ $(cat astyle-files-changed.out | grep Formatted | wc -l) -ne 0 ]; then
             git --no-pager diff;
             echo "";