rename gprs_gsup_client.h to gsup_client.h

This is in preparation for moving gsup to libcommon, which is in turn
preparation for libvlr.

Related: OS#1592
Change-Id: I9c95d00f1a9420887a44c938b1d0ee3e20586f4c
diff --git a/openbsc/src/gprs/sgsn_vty.c b/openbsc/src/gprs/sgsn_vty.c
index 1b477e5..21c865b 100644
--- a/openbsc/src/gprs/sgsn_vty.c
+++ b/openbsc/src/gprs/sgsn_vty.c
@@ -34,7 +34,7 @@
 #include <osmocom/gprs/gprs_ns.h>
 #include <openbsc/gprs_sgsn.h>
 #include <openbsc/vty.h>
-#include <openbsc/gprs_gsup_client.h>
+#include <openbsc/gsup_client.h>
 
 #include <osmocom/vty/command.h>
 #include <osmocom/vty/vty.h>