silence various warnings

src/cmd/auth/factotum/conv.c

@@ -105,7 +105,7 @@ convgetrpc(Conv *c, int want)
 			return &c->rpc;
 		rpcrespond(c, "phase in state '%s' want '%s'", c->state, rpcname[want]);
 	}
-	return nil;	/* not reached */
+	/* not reached */
 }
 
 /* read until the done function tells us that's enough */

src/cmd/auth/factotum/fs.c

@@ -159,7 +159,7 @@ readlist(int off, int (*gen)(int, char*, uint), Req *r)
 		a += n;
 		off++;
 	}
-	return -1;		/* not reached */
+	/* not reached */
 }
 
 static int