gprs: Fix compiler warnings ini gprs_sndcp_vty.c

   CC       gprs_sndcp_vty.o
gprs_sndcp_vty.c: In function ‘vty_dump_sne’:
gprs_sndcp_vty.c:46:15: warning: unused variable ‘i’ [-Wunused-variable]
  unsigned int i;
diff --git a/openbsc/src/gprs/gprs_sndcp_vty.c b/openbsc/src/gprs/gprs_sndcp_vty.c
index 28fdc63..deeef07 100644
--- a/openbsc/src/gprs/gprs_sndcp_vty.c
+++ b/openbsc/src/gprs/gprs_sndcp_vty.c
@@ -43,8 +43,6 @@
 
 static void vty_dump_sne(struct vty *vty, struct gprs_sndcp_entity *sne)
 {
-	unsigned int i;
-
 	vty_out(vty, " TLLI %08x SAPI=%u NSAPI=%u:%s",
 		sne->lle->llme->tlli, sne->lle->sapi, sne->nsapi, VTY_NEWLINE);
 	vty_out(vty, "  Defrag: npdu=%u highest_seg=%u seg_have=0x%08x tot_len=%u%s",