Intended unlock in `kvs_update`?

[Medowhill]

Hi. I'm a researcher working on concurrent programs written in C and completely new to this project.

While reading the code, I found the following part in kvs_update:

streem/src/kvs.c

Lines 113 to 119 in d022e83

	pthread_mutex_unlock(&k->lock);
	/* call function */
	if (strm_funcall(strm, args[2], 1, &old, &val) == STRM_NG) {
	pthread_mutex_unlock(&k->lock);
	return STRM_NG;
	}

After k->lock is released in 113, it's released again in line 117. Unless strm_funcall returns after acquiring k->lock, line 117 would not be necessary. I don't fully understand the behavior of strm_funcall, but I can't find such cases yet. I'm wondering whether line 117 is intentional and necessary or could be removed.

Thank you.