protocol: fix tagging of wildcarded requests

When a wildcarded CRCX is done flag "wildcarded_crcx" is set in the
endpoint struct. The flag tells other part of the code whether the
request was wildcarded or not since in some cases the behaviour
might be different for wildcarded requests. The implementation of
this mechanism is not entirely correct. The flag is set on wildcarded
requests but on non wildcarded requests it is not reset. Also the
name is misleading.

- rename wildcarded_crcx to wildcarded_req

- ensure the flag is refreshed with every new request

Change-Id: Ia5063ec65f5bc3a8a0943d1fd823aaeee20b8637
diff --git a/src/libosmo-mgcp/mgcp_endp.c b/src/libosmo-mgcp/mgcp_endp.c
index 77310c6..6d3a6d4 100644
--- a/src/libosmo-mgcp/mgcp_endp.c
+++ b/src/libosmo-mgcp/mgcp_endp.c
@@ -51,5 +51,5 @@
 	endp->local_options.string = NULL;
 	talloc_free(endp->local_options.codec);
 	endp->local_options.codec = NULL;
-	endp->wildcarded_crcx = false;
+	endp->wildcarded_req = false;
 }