gprs/sgsn: rename gprs->mm_state -> gmm_state

GMM is the right term. MM state is already occupied.

Change-Id: I9cfdcf921e4ebd14a5e7ce7489ec4ce5d1f5515f
diff --git a/openbsc/src/gprs/sgsn_libgtp.c b/openbsc/src/gprs/sgsn_libgtp.c
index 072b9ba..062de44 100644
--- a/openbsc/src/gprs/sgsn_libgtp.c
+++ b/openbsc/src/gprs/sgsn_libgtp.c
@@ -676,7 +676,7 @@
 	msgb_bvci(msg) = mm->gb.bvci;
 	msgb_nsei(msg) = mm->gb.nsei;
 
-	switch (mm->mm_state) {
+	switch (mm->gmm_state) {
 	case GMM_REGISTERED_SUSPENDED:
 		/* initiate PS PAGING procedure */
 		memset(&pinfo, 0, sizeof(pinfo));
@@ -695,7 +695,7 @@
 		break;
 	default:
 		LOGP(DGPRS, LOGL_ERROR, "GTP DATA IND for TLLI %08X in state "
-			"%u\n", mm->gb.tlli, mm->mm_state);
+			"%u\n", mm->gb.tlli, mm->gmm_state);
 		msgb_free(msg);
 		return -1;
 	}