Fix crash rx DeactPdpReq while waiting for DeactPdpAck after gtp side is freed
Scenario: 1- For an unknwon reason, sgsn sends DeletePdpCtxReq on GTP towards GGSN. 2- GGSN answers with Error Indication to that pdp ctx which calls gtp_freepdp() 3- gtp_freepdp() calls libgtp callback cb_delete_context() before freeing the pointer, in osmo-sgsn callback points to cb_delete_context(), which removes pctx->ggsn and tries to drop the pdp on the NS side by sending a DeactPdpReq. 4- While waiting for DeactPdpAck, the MS/PCU sends a DeactPdpReq, and code was unconditionalyl trying to release the gtp side without checking if it was alreay released, using pctx->ggsn==NULL and crashing. This is basically the same logic already in place in regular path gsm48_rx_gsm_deact_pdp_ack. Related: OS#4817 Change-Id: I02587a3dc812823d893fc00b904142b75fd190b9
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