Merge pull request #1221 in FS/freeswitch from ~NBLASGEN/freeswitch:feature/FS-10084-mod_v8-block-for-event to master

* commit 'd9c6ebc8':
  FS-10084 [mod_v8] Fixed incorrect variable name
  FS-10084 [mod_v8] If the value passed is negative, block until event is received