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ptrap: fail if invoked with no arguments

--- a/sys/src/cmd/ptrap.c

+++ b/sys/src/cmd/ptrap.c

@@ -356,7 +356,7 @@

 	default: usage();

 	}ARGEND;

-	if(argc % 2) usage();

+	if(argc == 0 || argc % 2) usage();

 	for(i = 0; i < argc; i += 2){

 		f = emalloc9p(sizeof(PFilter));

 		f->name = strdup(argv[i]);