Delete freedns file after use

src/freedombone-freedns

         echo $"command: $FREEDNS_WGET${code}="
         $FREEDNS_WGET${code}=
     else
+        if [ -f /tmp/freedns ]; then
+            rm /tmp/freedns
+        fi
         $FREEDNS_WGET${code}= >> /tmp/freedns 2>&1
     fi
 done