CLEANUP: poll: remove a useless double-check on fdtab[fd].owner

This check is already performed a few lines above in the same loop,
remove it from the condition.
diff --git a/src/ev_epoll.c b/src/ev_epoll.c
index 8b0d684..a9b8410 100644
--- a/src/ev_epoll.c
+++ b/src/ev_epoll.c
@@ -161,7 +161,7 @@
 				((e & EPOLLHUP) ? FD_POLL_HUP : 0);
 		}
 
-		if (fdtab[fd].iocb && fdtab[fd].owner && fdtab[fd].ev) {
+		if (fdtab[fd].iocb && fdtab[fd].ev) {
 			int new_updt, old_updt = fd_nbupdt; /* Save number of updates to detect creation of new FDs. */
 
 			/* Mark the events as speculative before processing