mkae the new 'void *dst' member part of a union with the trx pointer

this ensures struct msgb is the same size as before, which will ensure
binary compatibility

diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index 08dfaac..915c4a0 100644 (file)
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -29,12 +29,13 @@
 struct msgb {
        struct llist_head list;
 
-       /* routing information. */
-       void *dst;
 
        /* Part of which TRX logical channel we were received / transmitted */
        /* FIXME: move them into the control buffer */
-       struct gsm_bts_trx *trx;
+       union {
+               void *dst;
+               struct gsm_bts_trx *trx;
+       };
        struct gsm_lchan *lchan;
 
        /* the Layer1 header (if any) */