in rdconf(), if namec(s, Aopen, OREAD, 0) returns nil, panic.

Notes:
Mon Jan 17 10:49:24 EST 2005 rsc
    namec cannot return nil.  it errors instead.


Reference: /n/sources/patch/sorry/devfs-rdconf-panic
Date: Mon Jan 17 16:49:43 CET 2005
Reviewed-by: rsc

--- /sys/src/9/port/devfs.c	Mon Jan 17 16:49:43 2005
+++ /sys/src/9/port/devfs.c	Mon Jan 17 16:49:43 2005
@@ -264,6 +264,8 @@
 		nexterror();
 	}
 	*ccp = namec(s, Aopen, OREAD, 0);
+	if (*ccp == nil)
+		panic("devfs rdconf %s", s);
 	devtab[(*ccp)->type]->read(*ccp, confstr, sizeof(confstr), 0);
 	cclose(*ccp);
 	*ccp = nil;