Travis CI: Simplify whitespace test.

Author: godbyk

.travis.yml

@@ -38,12 +38,8 @@ script:
   - popd
   # Fail if there is whitespace at the ends of any lines
   - if [ "$BUILD_TYPE" = "check-whitespace" ]; then
-      export TEST_STATUS=0;
-      grep '\s$' source/*.tex && export TEST_STATUS=1;
-    fi;
-    if [ "0$TEST_STATUS" != "00" ]; then
-      false;
-    fi;
+      ! grep '\s$' source/*.tex;
+    fi
   # Check to see if generated files are out-dated
   - pushd source
   - for FIGURE in *.dot; do