iuup: Fix decoding of 1byte-length subflow size fields

Change-Id: I78ae9e7d46d0725ddec05e004ae22ee5da738162
diff --git a/src/gsm/iuup.c b/src/gsm/iuup.c
index b838dc6..f526382 100644
--- a/src/gsm/iuup.c
+++ b/src/gsm/iuup.c
@@ -527,7 +527,7 @@
 		} else {
 			uint8_t *subflow_size = ihdr_rfci->subflow_length;
 			for (i = 0; i < ihdr->num_subflows_per_rfci; i++) {
-				iui->config.subflow_sizes[ihdr_rfci->rfci][i] = osmo_load16be(subflow_size);
+				iui->config.subflow_sizes[ihdr_rfci->rfci][i] = *subflow_size;
 				subflow_size++;
 			}
 		}