pibridge-serdev: clear uninitialized fields in gateway datagram
requested to merge linosanfilippo-kunbus/linux:fix/REVPI-4006/fix_new_firmware_upload_neu into revpi-6.1
Before commit 1e6a25eb ("pibridge-serdev: send datagrams in one") the packet header was allocated separately and the cleared via memset which ensured that the header fields do not contain uninitialized data. Now the header is allocated together with the data part but the memset is missing, so for the "src" and "seq" fields that data is not initialized. Fix this by setting these fields explicitly to 0.
Signed-off-by: Lino Sanfilippo l.sanfilippo@kunbus.com (cherry picked from commit cba0ef0b)