gdbstub: Fix handling of '!' packet with new infra

Since the '!' packet is not handled by the new infrastructure,
gdb_handle_packet() would call run_cmd_parser() with a NULL cmd_parser
value, which would lead to an unsupported packet ("$#00") being sent,
which could confuse the gdb client.

This also has a side-effect of speeding up the initial connection with
gdb.

Fixes: 3e2c126 ("gdbstub: Implement deatch (D pkt) with new infra")
Signed-off-by: Ramiro Polla <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Alex Bennée <[email protected]>

Author: ramiropolla

gdbstub.c

@@ -2588,7 +2588,9 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
         break;
     }
 
-    run_cmd_parser(s, line_buf, cmd_parser);
+    if (cmd_parser) {
+        run_cmd_parser(s, line_buf, cmd_parser);
+    }
 
     return RS_IDLE;
 }