Fix implicit-fallthrough compile error.
Fix implicit-fallthrough compile error.

This code block was causing a compile error:

```c
switch (tolower(*ptr)) {
  default: return false;
  case 'p': ap *= 1024;
  case 't': ap *= 1024;
  case 'g': ap *= 1024;
  case 'm': ap *= 1024;
  case 'k': ap *= 1024;
  case 'i':
  case 'b': break;
}
```

It was fixed by ignoring implicit-fallthrough errors.

bysin/cloudfs,bysin/cloudfs,bysin/cloudfs,bysin/cloudfs