ftp: register ftp.completion_code at response_complete

Ticket: #8392
(cherry picked from commit fc1546e25e)

src/detect-ftp-completion-code.c

@@ -92,10 +92,11 @@ void DetectFtpCompletionCodeRegister(void)
             "sticky buffer to match on the FTP completion code buffer";
     sigmatch_table[DETECT_FTP_COMPLETION_CODE].url = "/rules/" KEYWORD_DOC;
     sigmatch_table[DETECT_FTP_COMPLETION_CODE].Setup = DetectFtpCompletionCodeSetup;
-    sigmatch_table[DETECT_FTP_COMPLETION_CODE].flags |= SIGMATCH_NOOPT;
+    sigmatch_table[DETECT_FTP_COMPLETION_CODE].flags =
+            SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER | SIGMATCH_SUPPORT_FIREWALL;
 
-    DetectAppLayerMultiRegister(
-            BUFFER_NAME, ALPROTO_FTP, SIG_FLAG_TOCLIENT, 0, DetectFTPCompletionCodeGetData, 2);
+    DetectAppLayerMultiRegister(BUFFER_NAME, ALPROTO_FTP, SIG_FLAG_TOCLIENT, FTP_STATE_FINISHED,
+            DetectFTPCompletionCodeGetData, 2);
 
     DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);