FspTimer: clear structures at object creating

Author: facchinm

cores/arduino/FspTimer.h

@@ -58,8 +58,8 @@ class GPTimer {
 
     }
 
-    gpt_instance_ctrl_t ctrl;
-    gpt_extended_cfg_t ext_cfg;
+    gpt_instance_ctrl_t ctrl = { 0 };
+    gpt_extended_cfg_t ext_cfg = { 0 };
 
 
 };