[*] fix decr_128 and add missing decr_256

dap-sdk/core/include/dap_math_ops.h

@@ -317,11 +317,11 @@ static inline void DECR_128(uint128_t* a_128_bit){
     (*a_128_bit)--;
 
 #else
+    if (a_128_bit->lo == 0) {
+        a_128_bit->hi--;
+    }
     a_128_bit->lo--;
-   if(a_128_bit->hi == 0)
-   {
-       a_128_bit->hi--;
-   }
+
 #endif
 }
 
@@ -343,6 +343,20 @@ static inline void INCR_256(uint256_t* a_256_bit){
 #endif
 }
 
+static inline void DECR_256(uint256_t* a_256_bit) {
+#ifdef DAP_GLOBAL_IS_INT128
+    if (a_256_bit->lo == 0) {
+        a_256_bit->hi--;
+    }
+    a_256_bit->lo--;
+#else
+    if(EQUAL_128(a_256_bit->lo, uin128_0)) {
+        DECR_128(&a_256_bit->hi);
+    }
+    DECR_128(&a_256_bit->lo);
+#endif
+}
+
 static inline int SUM_64_64(uint64_t a_64_bit,uint64_t b_64_bit,uint64_t* c_64_bit )
 {
     int overflow_flag;