Squid-2.2.STABLE2: comm_poll NULL write handler warning
  This patch is an attempt in fixing/locating those "NULL write handler"
  warnings which may be seen when poll is enabled.

Index: squid/src/comm_select.c
diff -u squid/src/comm_select.c:1.1.1.8 squid/src/comm_select.c:1.1.1.8.10.1
--- squid/src/comm_select.c:1.1.1.8	Sun Jan 24 09:34:08 1999
+++ squid/src/comm_select.c	Fri May  7 16:08:55 1999
@@ -199,15 +199,15 @@
 	    if ((hdl = fd_table[fd].read_handler)) {
 		fd_table[fd].read_handler = NULL;
 		hdl(fd, &incame);
-	    } else
-		debug(5, 1) ("comm_poll_incoming: NULL read handler\n");
+	    } else if (revents & (POLLRDNORM | POLLIN))
+		debug(5, 1) ("comm_poll_incoming: fd %d NULL read handler\n", fd);
 	}
 	if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) {
 	    if ((hdl = fd_table[fd].write_handler)) {
 		fd_table[fd].write_handler = NULL;
 		hdl(fd, &incame);
-	    } else
-		debug(5, 1) ("comm_poll_incoming: NULL write handler\n");
+	    } else if (revents & (POLLWRNORM | POLLOUT))
+		debug(5, 1) ("comm_poll_incoming: fd %d NULL write handler\n", fd);
 	}
     }
     return incame;