Change ownership if file exists

src/freedombone-client

@@ -94,8 +94,8 @@ function refresh_gpg_keys {
         fi
     fi
     sudo cp /etc/crontab ~/temp_crontab
-    sudo chown "$CURR_USER":"$CURR_GROUP" ~/temp_crontab
     if [ -f ~/temp_crontab ]; then
+        sudo chown "$CURR_USER":"$CURR_GROUP" ~/temp_crontab
         if grep -q 'test' ~/temp_crontab; then
             if ! grep -q 'gpg --refresh-keys' ~/temp_crontab; then
                 echo "0            */$REFRESH_GPG_KEYS_HOURS *   *   *   $CURR_USER /usr/bin/gpg --refresh-keys > /dev/null" >> ~/temp_crontab