gprs_ns: fix typo in comment

Change-Id: Ie9d8decea18542cb0e1641dcb5fca5e4850910eb
diff --git a/src/gb/gprs_ns.c b/src/gb/gprs_ns.c
index 14fe661..a6ef6d4 100644
--- a/src/gb/gprs_ns.c
+++ b/src/gb/gprs_ns.c
@@ -619,7 +619,7 @@
 	return gprs_ns_tx(nsvc, msg);
 }
 
-/*! Transmit a NS-BLOCK on a tiven NS-VC
+/*! Transmit a NS-BLOCK on a given NS-VC
  *  \param[in] nsvc NS-VC on which the NS-BLOCK is to be transmitted
  *  \param[in] cause Numeric NS Cause value
  *  \returns 0 in case of success