SML parser: remove commented-out code

the comparison is part of the original library code, but the compiler
rightfully complains that the comparison byte <= 0xFF is always true,
since byte is uint8_t. the comparison was commented out, and is now
removed.

lib/SMLParser/sml.cpp

@@ -171,7 +171,7 @@ void checkMagicByte(unsigned char &byte)
       // Datatype Octet String
       setState(SML_HDATA, (byte & 0x0F) << 4);
     }
-    else if (byte >= 0xF0 /*&& byte <= 0xFF*/) {
+    else if (byte >= 0xF0) {
       /* Datatype List of ...*/
       setState(SML_LISTEXTENDED, (byte & 0x0F) << 4);
     }