[master] 005f88847 vtc: Polish error message

[Dridi Boukelmoune]

commit 005f888471e004a8d512caa5118b83fad164dccc
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Feb 23 18:57:30 2021 +0100

    vtc: Polish error message

diff --git a/bin/varnishtest/vtc_http2.c b/bin/varnishtest/vtc_http2.c
index cb1c6b5f5..e10b11a93 100644
--- a/bin/varnishtest/vtc_http2.c
+++ b/bin/varnishtest/vtc_http2.c
@@ -864,7 +864,7 @@ receive_frame(void *priv)
 	do {								\
 		n = strtoul(ss, &p, 0);					\
 		if (*p != '\0')						\
-			vtc_fatal(v, "%s takes an integer as argument"	\
+			vtc_fatal(v, "%s takes an integer as argument "	\
 				"(found %s)", c, ss);			\
 	} while (0)