* subversion/libsvn_diff/diff_file.c
  (svn_diff_file_options_parse): Following up on r1603847, remove
    checking for 0 and negative context size. The api already handles these
    as 3 lines of context.

Suggested by: stsp


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1603875 13f79535-47bb-0310-9956-ffa450edef68