confd: Skip extraneous calls to sr_unsubscribe

core.c will always take care of this if any initialization fails.

src/confd/src/ietf-interfaces.c

@@ -326,7 +326,5 @@ int ietf_interfaces_init(struct confd *confd)
 	return SR_ERR_OK;
 fail:
 	ERROR("init failed: %s", sr_strerror(rc));
-	sr_unsubscribe(confd->sub);
-
 	return rc;
 }

src/confd/src/ietf-system.c

@@ -634,7 +634,5 @@ int ietf_system_init(struct confd *confd)
 	return SR_ERR_OK;
 fail:
 	ERROR("init failed: %s", sr_strerror(rc));
-	sr_unsubscribe(confd->sub);
-
 	return rc;
 }