[SGSN] Fix segfault when doing PS PAGING
The 'bssgp_paging_info' contains a pointer to the P-TMSI, and not
the P-TMSI itself. The reason is that it is an optional BSSGP IE.
diff --git a/openbsc/src/gprs/sgsn_libgtp.c b/openbsc/src/gprs/sgsn_libgtp.c
index b9c6605..ed15bbe 100644
--- a/openbsc/src/gprs/sgsn_libgtp.c
+++ b/openbsc/src/gprs/sgsn_libgtp.c
@@ -393,7 +393,7 @@
pinfo.scope = BSSGP_PAGING_BVCI;
pinfo.bvci = mm->bvci;
pinfo.imsi = mm->imsi;
- pinfo.ptmsi = mm->p_tmsi;
+ pinfo.ptmsi = &mm->p_tmsi;
pinfo.drx_params = mm->drx_parms;
pinfo.qos[0] = 0; // FIXME
rc = gprs_bssgp_tx_paging(mm->nsei, 0, &pinfo);