mgcp_endp: cosmetic move mgcp_endp_release to the end

It is more logical to move the function mgcp_endp_release to the end
since it is used to release the endpoint when it is no longer needed for
any transmission. (Also the follow up patch requires the function to be
moved)

Change-Id: Id3166a6a817ddb9ce36ff1b375ff8ed3598a00c2
diff --git a/include/osmocom/mgcp/mgcp_endp.h b/include/osmocom/mgcp/mgcp_endp.h
index b130050..08b966f 100644
--- a/include/osmocom/mgcp/mgcp_endp.h
+++ b/include/osmocom/mgcp/mgcp_endp.h
@@ -130,7 +130,6 @@
 };
 
 struct mgcp_endpoint *mgcp_endp_alloc(struct mgcp_trunk *trunk, unsigned int index);
-void mgcp_endp_release(struct mgcp_endpoint *endp);
 int mgcp_endp_claim(struct mgcp_endpoint *endp, const char *callid);
 void mgcp_endp_update(struct mgcp_endpoint *endp);
 bool mgcp_endp_is_wildcarded(const char *epname);
@@ -145,3 +144,4 @@
 			 const struct mgcp_trunk *trunk);
 struct mgcp_endpoint *mgcp_endp_find_specific(const char *epname,
 			const struct mgcp_trunk *trunk);
+void mgcp_endp_release(struct mgcp_endpoint *endp);