json: Fix check for unbalanced right curly brace

We immediately diagnose unbalanced right curly brace:

    $ qemu-kvm --nodefaults --nographic --qmp stdio
    {"QMP": {"version": {"qemu": {"micro": 91, "minor": 2, "major": 4},
    "package": "v5.0.0-rc1-1-gf6ce4a439a08"}, "capabilities": ["oob"]}}
    }
    {"error": {"class": "GenericError", "desc": "JSON parse error,
    expecting value"}}

except within square bracket:

    [}

The check for unbalanced braces has a typo.  Fix it.

Fixes: 8d3265b
Signed-off-by: Simran Singhal <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Message-Id: <20200402182848.GA3023@simran-Inspiron-5558>
Reviewed-by: Markus Armbruster <[email protected]>
[Commit message rewritten to explain what's broken]
Signed-off-by: Markus Armbruster <[email protected]>

Author: simransinghal

qobject/json-streamer.c

@@ -85,7 +85,7 @@ void json_message_process_token(JSONLexer *lexer, GString *input,
     g_queue_push_tail(&parser->tokens, token);
 
     if ((parser->brace_count > 0 || parser->bracket_count > 0)
-        && parser->bracket_count >= 0 && parser->bracket_count >= 0) {
+        && parser->brace_count >= 0 && parser->bracket_count >= 0) {
         return;
     }