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9gc: exit if no chat found

--- a/9gc.c

+++ b/9gc.c

@@ -25,10 +25,6 @@

 	Joined = 1<<2,

 };

-#define max(a,b) ((a)>(b)?(a):(b))

-#define used(x) ((void)(x))

-#define nelem(x) (int)(sizeof(x)/sizeof((x)[0]))

-

 typedef struct C9aux C9aux;

 typedef struct REntry REntry;

@@ -243,7 +239,6 @@

 			*s = 0;

 			if (strstr(b, "tlssrv") == NULL && (s = strchr(b, ' ')) != NULL) {

 				*s = 0;

-				printf("chat is at %s\n", b);

 				close(a->f);

 				if ((a->f = dial(b)) < 0)

 					exit(1);

@@ -251,11 +246,14 @@

 				a->r = ctxchatR;

 				a->wroff = a->wrend = 0;

 				c9version(ctx, &tag, Msize);

-				wrsend(a);

-				break;

+				if (wrsend(a) != 0)

+					exit(1);

+				return;

 			}

 		}

+		fprintf(stderr, "chat hasn't been found in the registry\n");

+		exit(1);

 		break;

 	case Rerror: