hcidump: use correct size to copy 'direction' value

frm.in is stored as an uint8_t, so we cannot copy an int there
directly.  use an intermediate variable so that it also works
on big-endian systems.
diff --git a/src/hcidump.c b/src/hcidump.c
index 2023130..f865ad6 100644
--- a/src/hcidump.c
+++ b/src/hcidump.c
@@ -281,9 +281,11 @@
 		cmsg = CMSG_FIRSTHDR(&msg);
 		while (cmsg) {
+			int dir;
 			switch (cmsg->cmsg_type) {
 			case HCI_CMSG_DIR:
-				memcpy(&frm.in, CMSG_DATA(cmsg), sizeof(int));
+				memcpy(&dir, CMSG_DATA(cmsg), sizeof(int));
+				frm.in = (uint8_t) dir;
 				memcpy(&frm.ts, CMSG_DATA(cmsg),