tracing: Remove useless code in dynevent_arg_pair_add()

The final addition to q is unnecessary, since q isn't ever used
afterwards.

Link: http://lkml.kernel.org/r/7880a1268217886cdba7035526650195668da856.1580506712.git.zanussi@kernel.orgReviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/trace_dynevent.c

@@ -322,7 +322,7 @@ int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
 		pr_err("field string is too long: %s\n", arg_pair->rhs);
 		return -E2BIG;
 	}
-	cmd->remaining -= delta; q += delta;
+	cmd->remaining -= delta;
 
 	return ret;
 }