fix(cc): Fix zwave_command_class_user_code.c frame size checking

Observed by ctest which was sporadically (1/10~)failing on
zwave_command_class_user_code_test

The change is trivial, since the 2s two bytes of frame is the class
and the command, the handler should at least test the minimal lenght
of 2 (so >= command index which is one).

I have been running this test in loop over 30min and more
and no more failing occured.

Note I have observed this mistake in other CC,
which will be fixed in later changes (and tests eventually hardened).

Origin: SiliconLabsSoftware#111
Relate-to: SiliconLabsSoftware/z-wave-engine-application-layer#10
Relate-to: SiliconLabsSoftware#110
Signed-off-by: Philippe Coval <[email protected]>

Author: rzr

applications/zpc/components/zwave_command_classes/src/zwave_command_class_user_code.c

@@ -1346,7 +1346,7 @@ static sl_status_t zwave_command_class_user_code_control_handler(
   const uint8_t *frame,
   uint16_t frame_length)
 {
-  if (frame_length < COMMAND_INDEX) {
+  if (frame_length <= COMMAND_INDEX) {
     return SL_STATUS_NOT_SUPPORTED;
   }