logging: fix default initialization of per-category loglevels

Before this patch, there was a bug in the code caused by a memcpy
from one data structure to another. unfortuantely the data structures
were not the same, so we have to explicitly iterate over the array
and assign the structure members manually.

src/logging.c

@@ -311,16 +311,26 @@ static void _stderr_output(struct log_target *target, const char *log)
 struct log_target *log_target_create(void)
 {
 	struct log_target *target;
+	unsigned int i;
 
 	target = talloc_zero(tall_log_ctx, struct log_target);
 	if (!target)
 		return NULL;
 
 	INIT_LLIST_HEAD(&target->entry);
-	memcpy(target->categories, log_info->cat,
-		sizeof(struct log_category)*log_info->num_cat);
+
+	/* initialize the per-category enabled/loglevel from defaults */
+	for (i = 0; i < log_info->num_cat; i++) {
+		struct log_category *cat = &target->categories[i];
+		cat->enabled = log_info->cat[i].enabled;
+		cat->loglevel = log_info->cat[i].loglevel;
+	}
+
+	/* global settings */
 	target->use_color = 1;
 	target->print_timestamp = 0;
+
+	/* global log level */
 	target->loglevel = 0;
 	return target;
 }