stupid error on prolific chip disconnection recovery

Reference: /n/sources/patch/applied/serial_errors
Date: Mon Feb  1 12:13:28 CET 2010
Signed-off-by: paurea@lsub.org

--- /sys/src/cmd/usb/serial/prolific.c	Mon Feb  1 12:12:53 2010
+++ /sys/src/cmd/usb/serial/prolific.c	Mon Feb  1 12:12:49 2010
@@ -340,7 +340,7 @@
 	snprint(err, sizeof err, "%r");
 	dsprint(2, "serial: interrupt read %d %r\n", nr);
 
-	if(nr < 0 && strstr(err, "timed out") != nil){
+	if(nr < 0 && strstr(err, "timed out") == nil){
 		dsprint(2, "serial: need to recover, status read %d %r\n", nr);
 		if(serialrecover(ser, err) < 0){
 			qunlock(ser);