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msgb: Also copy msgb {dst, lchan, cb} during msgb_copy_*

It wasn't really specified if those fields are supposed to be copied.
But after all, a copy is supposed to behave exactly like the original,
not just in terms of the data but all aspects.

Change-Id: I68328adb952ca8833ba047cb3b49ccc6f8a1f1b5
---
M src/core/msgb.c
1 file changed, 18 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/24/36324/1

diff --git a/src/core/msgb.c b/src/core/msgb.c
index 713510c..b79dc32 100644
--- a/src/core/msgb.c
+++ b/src/core/msgb.c
@@ -356,6 +356,11 @@
 	if (msg->l4h)
 		new_msg->l4h = new_msg->_data + (msg->l4h - msg->_data);
 
+	/* copy other metadata like cb */
+	new_msg->dst = msg->dst;
+	new_msg->lchan = msg->lchan;
+	memcpy(new_msg->cb, msg->cb, sizeof(new_msg->cb));
+
 	return new_msg;
 }
 

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