gsm0808: cosmetic: rename parameter "reason" to "cause"

The function that generates the clear command takes a parameter
"reason", which is the cause code. Lets give it the name "cause" to have
a coherent naming scheme that matches the other functions and the 3gpp
specs.

Change-Id: I7b6c15e8fa8db13deef5041095944ca1c58fb99f
diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
index ad90008..9ccca4d 100644
--- a/src/gsm/gsm0808.c
+++ b/src/gsm/gsm0808.c
@@ -182,9 +182,9 @@
 }
 
 /*! Create BSSMAP Clear Command message
- *  \param[in] reason TS 08.08 cause value
+ *  \param[in] cause TS 08.08 cause value
  *  \returns callee-allocated msgb with BSSMAP Clear Command message */
-struct msgb *gsm0808_create_clear_command(uint8_t reason)
+struct msgb *gsm0808_create_clear_command(uint8_t cause)
 {
 	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
 					       "bssmap: clear command");
@@ -193,7 +193,7 @@
 
 	msg->l3h = msgb_tv_put(msg, BSSAP_MSG_BSS_MANAGEMENT, 4);
 	msgb_v_put(msg, BSS_MAP_MSG_CLEAR_CMD);
-	msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &reason);
+	msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &cause);
 
 	return msg;
 }