UdpContext - check after pbuf_alloc for errors #3354
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I've hit cases where
pbuf_alloc()returns anullptr. In the original code, it would happily try to dereference this, and I'd get "Exception 28". I've updatedUdpContextto check for this condition, and pass along that something has gone wrong. In the case ofsend(), that means returning false, and forappend(), return that 0 bytes were actually appended.