BUG/MINOR: config: missing goto out after parsing an incorrect ACL character

The error doesn't prevent checking for other errors after an invalid
character was detected in an ACL name. Better quit ASAP to avoid risking
to emit garbled and confusing error messages if something else fails on
the same line.

This should be backported to 1.7, 1.6 and 1.5.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index e1b6b3e..47d33cf 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -3154,6 +3154,7 @@
 			Alert("parsing [%s:%d] : character '%c' is not permitted in acl name '%s'.\n",
 			      file, linenum, *err, args[1]);
 			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
 		}
 
 		if (parse_acl((const char **)args + 1, &curproxy->acl, &errmsg, &curproxy->conf.args, file, linenum) == NULL) {