signature: checks protocol for file.name keyword

By setting the flags as for the filename keyword (not sticky version)

src/detect-filename.c

@@ -349,6 +349,7 @@ static int DetectFilenameSetupSticky(DetectEngineCtx *de_ctx, Signature *s, cons
 {
     if (DetectBufferSetActiveList(s, g_file_name_buffer_id) < 0)
         return -1;
+    s->file_flags |= (FILE_SIG_NEED_FILE | FILE_SIG_NEED_FILENAME);
     return 0;
 }
 

src/detect-parse.c

@@ -1857,6 +1857,11 @@ static int SigValidate(DetectEngineCtx *de_ctx, Signature *s)
                     "support file matching", AppProtoToString(s->alproto));
             SCReturnInt(0);
         }
+        if (s->alproto == ALPROTO_HTTP2 && (s->file_flags & FILE_SIG_NEED_FILENAME)) {
+            SCLogError(SC_ERR_NO_FILES_FOR_PROTOCOL,
+                    "protocol HTTP2 doesn't support file name matching");
+            SCReturnInt(0);
+        }
 
         if (s->alproto == ALPROTO_HTTP) {
             AppLayerHtpNeedFileInspection();