Fix whitespace errors in tor-fw-helper
There are some whitespace errors in tor-fw-helper:
$ make check-spaces
./contrib/checkSpace.pl -C \
src/common/*.h \
src/common/[^asO]*.c src/common/address.c \
src/or/[^et]*.[ch] src/or/t*.c src/or/eventdns_tor.h \
src/test/test*.[ch] src/tools/*.[ch] \
src/tools/tor-fw-helper/*.[ch]
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:148
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:157
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:164
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:171
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:187
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:190
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:196
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:201
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:207
Wide:src/tools/tor-fw-helper/tor-fw-helper.c:212