Prevent a (false positive) pointer to int conversion warning in FSX and
solve an int / pointer usage problem at the same time.

* subversion/libsvn_fs_x/index.c
  (encode_l2p_page): Use the void* result to check for entry presence
                     and convert to int only as a second step.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1619085 13f79535-47bb-0310-9956-ffa450edef68