clean up a bit of error handling just to get rid of

  sockperf.c: In function 'main':
  sockperf.c:206:18: warning: variable 'rv' set but not used [-Wunused-but-set-variable]


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1460399 13f79535-47bb-0310-9956-ffa450edef68