Merge r3898: Fix compilation problem on Darwin

git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@3989 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/vtc.c

@@ -238,16 +238,17 @@ cmd_test(CMD_ARGS)
 static void
 cmd_shell(CMD_ARGS)
 {
-
 	(void)priv;
 	(void)cmd;
+	int r;
 
 	if (av == NULL)
 		return;
 	AN(av[1]);
 	AZ(av[2]);
 	vtc_dump(vl, 4, "shell", av[1]);
-	assert(WEXITSTATUS(system(av[1])) == 0);
+	r = system(av[1]);
+	assert(WEXITSTATUS(r) == 0);
 }
 
 /**********************************************************************