Fix fdset caching.

Need to keep track of current size of fdset, assignment was reversed.

src/nrpe.c

@@ -1202,7 +1202,7 @@ void wait_for_connections(void)
 		if (need_fdset > count_fdset) {
 			free(fdset);
 			fdset = (fd_set *) calloc(need_fdset, sizeof(fd_mask));
-			need_fdset = count_fdset;
+			count_fdset = need_fdset;
 		} else {
 			memset(fdset, 0, count_fdset * sizeof(fd_mask));
 		}