[Rpm-maint] [rpm-software-management/rpm] legacy.c: Fix headerGetEntry count (#399)

[Alexey Tourbin]

The following code used to work with rpm-4.0.
```c
static int getFileCount(Header h)
{
   int count;
   int ret = headerGetEntry(h, RPMTAG_BASENAMES, NULL, NULL, &count);
   return ret == 1 ? count : 0;
}
```

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