Follow up to r10676: Conditionalize more checksum-related code.
Follow up to r10676: Conditionalize more checksum-related code.

* subversion/libsvn_wc/questions.c
  (compare_and_verify): Don't bother to calculate checksum at all if
    entry->checksum is null.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion