Bug 979913: Remove unused variables, r=khuey

mozglue/build/Nuwa.cpp

@@ -662,8 +662,6 @@ SaveTLSInfo(thread_info_t *tinfo) {
  */
 static void
 RestoreTLSInfo(thread_info_t *tinfo) {
-  int rv;
-
   for (TLSInfoList::const_iterator it = tinfo->tlsInfo.begin();
        it != tinfo->tlsInfo.end();
        it++) {