Don't exit rtpp_polltbl_free() early if the allocated length

is 0. We still need to destroy few things here, might cause
descriptor leak under librtpproxy.

Author: sobomax

src/rtpp_sessinfo.c

@@ -373,19 +373,16 @@ rtpp_polltbl_free(struct rtpp_polltbl *ptbl)
 {
     int i;
 
-    if (ptbl->aloclen == 0) {
-        return;
-    }
-    if (ptbl->curlen > 0) {
+    if (ptbl->aloclen != 0) {
         for (i = 0; i < ptbl->curlen; i++) {
             int fd = CALL_SMETHOD(ptbl->mds[i].skt, getfd);
             rtpp_epoll_ctl(ptbl->epfd, EPOLL_CTL_DEL, fd, NULL);
             RTPP_OBJ_DECREF(ptbl->mds[i].skt);
         }
+        free(ptbl->mds);
     }
     close(ptbl->wakefd[0]);
     close(ptbl->epfd);
-    free(ptbl->mds);
 }
 
 static int