bugfix for broken presets when segment name is very long

another off-by-one

wled00/FX_fcn.cpp

@@ -1747,7 +1747,7 @@ void WS2812FX::enumerateLedmaps() {
   //WLEDMM add segment names to be used as ledmap names
   uint8_t segment_index = 0;
   for (segment &seg : _segments) {
-    if (seg.name != nullptr && strcmp(seg.name, "") != 0) {
+    if (seg.name != nullptr && strlen(seg.name) > 0) {
       char fileName[33];
       snprintf_P(fileName, sizeof(fileName), PSTR("/lm%s.json"), seg.name);
       bool isFile = WLED_FS.exists(fileName);

wled00/json.cpp

@@ -145,9 +145,9 @@ bool deserializeSegment(JsonObject elem, byte it, byte presetId)
     const char * name = elem["n"].as<const char*>();
     size_t len = 0;
     if (name != nullptr) len = strlen(name);
-    if (len > 0 && len < 33) {
+    if (len > 0 && len < 32) {
       seg.name = new char[len+1];
-      if (seg.name) strlcpy(seg.name, name, 33);
+      if (seg.name) strlcpy(seg.name, name, len+1);
     } else {
       // but is empty (already deleted above)
       elem.remove("n");