Exit on failure

src/freedombone-utils-cryptopp

     if [ -d "$INSTALL_DIR/cryptopp" ]; then
         if ! grep -q "Crypto++ commit:$CRYPTOPP_COMMIT" "$COMPLETION_FILE"; then
             set_repo_commit "$INSTALL_DIR/cryptopp" "Crypto++ commit" "$CRYPTOPP_COMMIT" "$CRYPTOPP_REPO"
-            cd $INSTALL_DIR/cryptopp/build
+            cd "$INSTALL_DIR/cryptopp/build" || exit 27482468
             cmake ..
             if ! make; then
                 exit 72581