nuttx/libs/libc/time: fix runtime error by UBSan
@@ -461,7 +461,7 @@ static int_fast64_t detzcode64(FAR const char *codep)
result = (codep[0] & 0x80) ? -1 : 0;
for (i = 0; i < 8; ++i)
{
- result = (result << 8) | (codep[i] & 0xff);
+ result = (result * 256) | (codep[i] & 0xff);
}
return result;
