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_poll.c b/src/ev_poll.c
index 2c7501d..c09232e 100644
--- a/src/ev_poll.c
+++ b/src/ev_poll.c
@@ -170,7 +170,7 @@
 				((e & POLLHUP) ? FD_POLL_HUP : 0);
 		}
 
-		if (fdtab[fd].iocb && fdtab[fd].owner && fdtab[fd].ev) {
+		if (fdtab[fd].iocb && fdtab[fd].ev) {
 			/* Mark the events as speculative before processing
 			 * them so that if nothing can be done we don't need
 			 * to poll again.