COSMETIC: moving rr_cause_name() in gsm48.c

rr_cause_name() is located a far of from
value_string rr_cause_names[] while other value string
functions are located right below their related value
string definitions. This commit moves rr_cause_name()
below rr_cause_names[] as it should be

Change-Id: Ie6c03a6ea02c370d8733db5ba2a709610cd70ce7
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index b4740cf..46f0b2f 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -162,6 +162,11 @@
 	{ 0,					NULL },
 };
 
+const char *rr_cause_name(uint8_t cause)
+{
+	return get_value_string(rr_cause_names, cause);
+}
+
 /* FIXME: convert to value_string */
 static const char *cc_state_names[32] = {
 	"NULL",
@@ -250,11 +255,6 @@
 	return get_value_string(cc_msg_names, msgtype);
 }
 
-const char *rr_cause_name(uint8_t cause)
-{
-	return get_value_string(rr_cause_names, cause);
-}
-
 const struct value_string gsm48_chan_mode_names[] = {
 	{ GSM48_CMODE_SIGN,		"SIGNALLING" },
 	{ GSM48_CMODE_SPEECH_V1,	"SPEECH_V1" },