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_select.c b/src/ev_select.c
index 356eed7..48a62da 100644
--- a/src/ev_select.c
+++ b/src/ev_select.c
@@ -156,7 +156,7 @@
 			if (FD_ISSET(fd, tmp_evts[DIR_WR]))
 				fdtab[fd].ev |= FD_POLL_OUT;
 
-			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.