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

[Michael Schroeder]

My suggested fix was wrong, it should be:
```
if (((!nb || *q != '\\') && !bc && !pc && !xc) || *(q+1) == '\0') {
```

Back to the pointer comparison: an even saner approach for this issue would be to let q point to the newline and not the char before the newline.

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