[Rpm-maint] [rpm-software-management/rpm] Undefined pointer comparison in macro.c (#1602)

[Michael Schroeder]

Of course the initialization can be easily fixed by doing a
```
*q = 0;  /* terminate */
```
at the top of the do loop and
```
q++;    /* move forward */
```
at the bottom. That way, q can be initialized to buf. (It will be decremented to buf-1 for empty lines nevertheless.)

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